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Income Taxes - Additional Information (Detail) (USD $)
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12 Months Ended | |||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Income Taxes [Line Items] | ||||
| Unrecognized tax benefit | $ 1,254,000 | $ 1,281,000 | $ 940,000 | $ 1,988,000 |
| Unrecognized tax benefits increased relating to acquisitions | 341,000 | |||
| Unrecognized tax benefits decreased relating to acquisitions | 27,000 | |||
| Unrecognized tax benefits decreased due to audit result from FTB | 1,000,000 | |||
| Accrued interest on uncertain tax benefits | 41,000 | 181,000 | ||
| Accrued interest reversed due to audit result from FTB | 136,000 | |||
| Accrued interest related to uncertain tax positions, net of federal tax benefit | 360,000 | 319,000 | 138,000 | |
| Valuation allowance | 82,269,000 | 92,679,000 | ||
| Net valuation allowance release | 62,600,000 | |||
| Operating loss carryforwards, maturity date | 2031 | |||
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Federal income tax [Member]
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| Income Taxes [Line Items] | ||||
| Net operating loss carryforwards | 39,900,000 | |||
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State income tax [Member]
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| Income Taxes [Line Items] | ||||
| Net operating loss carryforwards | $ 183,800,000 | |||
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Net valuation allowance release based on reassessment of the amount of its deferred tax assets that are more likely than not to be realized. No definition available.
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| X | ||||||||||
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- Definition
Total Unrecognized Net Of Federal Tax Benefit No definition available.
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| X | ||||||||||
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- Definition
Unrecognized Income Tax Benefits Decreases Relating To Settlements With Tax Authorities No definition available.
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| X | ||||||||||
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- Definition
This element represents the reversal of accrued interest for an overpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity No definition available.
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| X | ||||||||||
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- Definition
Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The sum of domestic, foreign and state and local operating loss carryforwards, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The expiration date of each operating loss carryforward included in total operating loss carryforwards, or the applicable range of such expiration dates. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Gross amount of decreases in unrecognized tax benefits resulting from acquisitions. No definition available.
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| X | ||||||||||
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- Definition
Gross amount of increases in unrecognized tax benefits resulting from acquisitions. No definition available.
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| X | ||||||||||
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- Definition
This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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