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Stockholders' Equity - Additional Information (Detail) (USD $)
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3 Months Ended | 24 Months Ended | |
|---|---|---|---|
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Mar. 31, 2015
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Mar. 31, 2014
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Dec. 31, 2014
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| Equity [Abstract] | |||
| Repurchase of available common stock, authorized amount | $ 85,000,000.0 | ||
| Shares repurchased under stock repurchase program | 300,000 | 0 | |
| Stock repurchased value exclusive of purchase and administrative costs | 4,400,000 | 48,600,000 | |
| Average price per share | $ 14.21 | ||
| Stock repurchase program remaining authorized repurchase amount | $ 32,000,000 | ||