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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Numerator:          
Net income $ 5,912 $ 5,408 $ 11,088 $ 9,491 $ 23,365
Denominator:          
Weighted average shares outstanding for basic earnings per share 11,756 12,845 12,256 12,812  
Effect of dilutive securities 218 233 206 228  
Weighted average shares adjusted for dilutive securities 11,974 13,078 12,462 13,040  
Basic $ 0.50 $ 0.42 $ 0.90 $ 0.74  
Diluted $ 0.49 $ 0.41 $ 0.89 $ 0.73