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Shareholders' Equity - Summary of Stock Option (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Equity [Abstract]        
Beginning balance of outstanding shares 1,877 1,727 1,807  
Granted, Shares 105 286 280  
Forfeitures, Shares (268) (106) (121)  
Exercised, Shares (195) (30) (239)  
Ending balance of outstanding, shares 1,519 1,877 1,727 1,807
Exercisable, Shares 959 977 655  
Beginning Balance of Outstanding Weighted Average Exercise Price $ 10.30 $ 10.12 $ 9.05  
Granted, Weighted Average Exercise Price 7.36 11.55 13.78  
Forfeitures, Weighted Average Exercise Price 11.91 12.31 12.45  
Exercised, Weighted Average Exercise Price 6.90 4.47 5.18  
Ending Balance of Outstanding Weighted Average Exercise Price 10.25 10.30 10.12 $ 9.05
Exercisable, Weighted Average Exercise Price $ 9.23 $ 8.48 $ 5.02  
Outstanding, Weighted Average Remaining Contractual Term 6 years 1 month 6 days 6 years 9 months 18 days 7 years 3 months 18 days 7 years 8 months 12 days
Exercisable, Weighted Average Remaining Contractual Term 5 years 3 months 18 days 5 years 4 months 24 days 5 years 9 months 18 days  
Outstanding, Aggregate Intrinsic Value $ 5,816 $ 1,769 $ 9,390  
Exercisable, Aggregate Intrinsic Value $ 4,608 $ 1,765 $ 5,332