Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Reconciliation and Income Statement Classification of Gains and Losses for All Assets and Liabilities (Parenthetical) (Detail)

v2.4.0.8
Fair Value Measurements - Reconciliation and Income Statement Classification of Gains and Losses for All Assets and Liabilities (Parenthetical) (Detail) (USD $)
6 Months Ended
Jun. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Exercise price of stock warrants 9.60
Class of warrant or rights date from which warrants or rights expiration date Oct. 14, 2015
Municipal bonds-tax exempt [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Par value of bond $ 700,000
Amortized value $ 698,000
Useful remaining life intangible assets 1 year 8 months 12 days