Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation between Federal Statutory Income Tax Rate and Effective Tax Rate (Detail)

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Income Taxes - Reconciliation between Federal Statutory Income Tax Rate and Effective Tax Rate (Detail)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation Of Effective Income Tax Rate [Line Items]      
Federal Statutory Income Tax Rate 35.00% 35.00% 35.00%
State Taxes, Net of Federal Tax Benefits 0.03% 0.00% (0.10%)
Tax-Exempt Municipal Securities (0.32%) (0.26%) 0.10%
Tax Credit - Federal (2.10%) (2.97%) 1.50%
Other (2.16%) (0.80%) 1.60%
Valuation Allowance (140.59%) (28.50%) (38.00%)
Effective Tax Rate (110.14%) 2.47% (0.10%)