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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, 2014 | Jul. 27, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Exercise price of stock warrants | $ 9.60 | $ 9.60
Class of warrant or rights date from which warrants or rights expiration date | Oct. 14, 2015 |
Carrying value of warrant | $ 400 |
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 | $ 699,000 |
Useful remaining life intangible assets | 8 months 27 days |

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