v2.4.1.9

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 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 5,053 us-gaap_NetIncomeLoss | $ 11,063 us-gaap_NetIncomeLoss | $ 10,154 us-gaap_NetIncomeLoss | $ 10,854 us-gaap_NetIncomeLoss | $ 11,212 us-gaap_NetIncomeLoss | $ 13,802 us-gaap_NetIncomeLoss | $ 15,502 us-gaap_NetIncomeLoss | $ 6,395 us-gaap_NetIncomeLoss | $ 37,123 us-gaap_NetIncomeLoss | $ 46,910 us-gaap_NetIncomeLoss | $ 19,811 us-gaap_NetIncomeLoss
Denominator: |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per share – weighted average shares |  |  |  |  |  |  |  |  | 20,714 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 20,676 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 21,680 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Employee stock options (in shares) |  |  |  |  |  |  |  |  | 107 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 88 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 52 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Denominator for diluted earnings per share – weighted average shares |  |  |  |  |  |  |  |  | 20,821 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 20,764 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 21,732 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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