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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity [Abstract]        
Beginning balance of outstanding shares 507 655 1,519  
Granted, Shares     128  
Forfeitures, Shares (31) (132) (700)  
Exercised, Shares (66) (16) (292)  
Ending balance of outstanding, shares 410 507 655 1,519
Exercisable, Shares 355 402 463  
Beginning Balance of Outstanding Weighted Average Exercise Price $ 10.43 $ 10.53 $ 10.25  
Granted, Weighted Average Exercise Price     9.24  
Forfeitures, Weighted Average Exercise Price 6.84 11.53 12.44  
Exercised, Weighted Average Exercise Price 4.10 5.55 3.92  
Ending Balance of Outstanding Weighted Average Exercise Price 11.45 10.43 10.53 $ 10.25
Exercisable, Weighted Average Exercise Price $ 12.08 $ 10.52 $ 10.49  
Outstanding, Weighted Average Remaining Contractual Term 4 years 8 months 12 days 5 years 2 months 12 days 6 years 6 years 1 month 6 days
Exercisable, Weighted Average Remaining Contractual Term 4 years 7 months 6 days 4 years 7 months 6 days 5 years 2 months 12 days  
Outstanding, Aggregate Intrinsic Value $ 32 $ 186 $ 78  
Exercisable, Aggregate Intrinsic Value $ 29 $ 186 $ 78