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Fair Value Measurements - Reconciliation and Income Statement Classification of Gains and Losses for All Assets and Liabilities (Parenthetical) (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Par value of bond | $ 419,903,000 | $ 451,060,000
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 | 2 years |

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