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Earnings Per Share - Computation of Basic and Diluted Net Earnings (Loss) Per Share (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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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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| Numerator: | |||||||||||
| Net income | $ 5,053 | $ 11,063 | $ 10,154 | $ 10,854 | $ 11,212 | $ 13,802 | $ 15,502 | $ 6,395 | $ 37,123 | $ 46,910 | $ 19,811 |
| Denominator: | |||||||||||
| Denominator for basic earnings per share – weighted average shares | 20,714 | 20,676 | 21,680 | ||||||||
| Effect of dilutive securities: | |||||||||||
| Employee stock options (in shares) | 107 | 88 | 52 | ||||||||
| Denominator for diluted earnings per share – weighted average shares | 20,821 | 20,764 | 21,732 | ||||||||