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Computation of Earnings Per Share - Summary of Calculation of Basic Earnings Per Common Share and Diluted Earnings Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Numerator:        
Net income $ 13,275 $ 19,247 $ 23,850 $ 31,852
Denominator:        
Denominator for basic earnings per share–weighted average common shares 25,030 24,936 25,014 24,870
Effect of dilutive stock options 43 128 45 143
Effect of other common stock equivalents 510 497 501 513
Denominator for diluted earnings per share–adjusted weighted average common shares 25,583 25,561 25,560 25,526
Basic Earnings Per Share $ 0.53 $ 0.77 $ 0.95 $ 1.28
Diluted Earnings Per Share $ 0.52 $ 0.75 $ 0.93 $ 1.25