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Income Taxes - Provision (Benefit) for Income Taxes Differs from Amounts Computed by Applying Statutory Federal Corporate Tax Rate (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Income Tax Disclosure [Abstract] | |||
| Provision (benefit) for income taxes at statutory rate | $ 3,403 | $ 3,440 | $ (3,166) |
| Tax effect of: | |||
| Tax-exempt investment income | (21) | (27) | (18) |
| Change in the beginning of the year balance of the valuation allowance for deferred tax assets allocated to income taxes | (22,427) | (4,277) | 580 |
| Stock-based compensation | 137 | 1,133 | 2,552 |
| State income taxes | 525 | 479 | (5) |
| Other | 38 | (98) | 52 |
| Income tax expense (benefit) | $ (18,345) | $ 650 | $ (5) |