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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]        
Beginning balance of outstanding shares 655 1,519 1,877  
Granted, Shares   128 105  
Forfeitures, Shares (132) (700) (268)  
Exercised, Shares (16) (292) (195)  
Ending balance of outstanding, shares 507 655 1,519 1,877
Exercisable, Shares 402 463 959  
Beginning Balance of Outstanding Weighted Average Exercise Price $ 10.53 $ 10.25 $ 10.30  
Granted, Weighted Average Exercise Price   9.24 7.36  
Forfeitures, Weighted Average Exercise Price 11.53 12.44 11.91  
Exercised, Weighted Average Exercise Price 5.55 3.92 6.90  
Ending Balance of Outstanding Weighted Average Exercise Price 10.43 10.53 10.25 $ 10.30
Exercisable, Weighted Average Exercise Price $ 10.52 $ 10.49 $ 9.23  
Outstanding, Weighted Average Remaining Contractual Term 5 years 2 months 12 days 6 years 6 years 1 month 6 days 6 years 9 months 18 days
Exercisable, Weighted Average Remaining Contractual Term 4 years 7 months 6 days 5 years 2 months 12 days 5 years 3 months 18 days  
Outstanding, Aggregate Intrinsic Value $ 186 $ 78 $ 5,816  
Exercisable, Aggregate Intrinsic Value $ 186 $ 78 $ 4,608