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Significant Accounting Policies - Reconciliation of Numerators and Denominators of Basic and Diluted Earnings per Share - (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Numerator:                      
Net income $ 8,671 $ 15,304 $ 18,225 $ 27,898 $ 6,883 $ (3,368) $ 11,873 $ 13,852 $ 70,098 $ 29,240 $ 34,602
Denominator:                      
Total weighted average basic shares                 33,993 33,523 33,192
Shares applicable to stock-based compensation                 1,183 609 270
Total weighted average diluted shares 35,103 35,665 35,371 34,572 34,172 33,670 34,125 34,036 35,176 34,132 33,462
Earnings per share – basic                 $ 2.06 $ 0.87 $ 1.04
Earnings per share – diluted $ 0.25 [1] $ 0.43 [1] $ 0.52 [1] $ 0.81 [1] $ 0.20 [1] $ (0.10) [1] $ 0.35 [1] $ 0.41 [1] $ 1.99 $ 0.86 $ 1.03
[1] The sum of quarterly per share amounts may not equal per share amounts for the year due to differences in weighted-average shares and/or equivalent shares outstanding for each of the periods presented.