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Stock Based Compensation - Summary of Activity of Performance Restricted Stock Units (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
PRSU Activity, Number of Awards      
Weighted-average period expense is expected to be recognized 2 years 3 months 18 days 2 years 7 months 6 days 3 years 4 months 24 days
Performance Restricted Stock Units [Member]      
PRSU Activity, Number of Awards      
Beginning balance (in shares) 254,543 175,790 179,931
Granted (in shares) 674,525 260,144 0
Vested (in shares) 0 (2,885) 0
Forfeited (in shares) (104,851) (178,506) (4,141)
Ending balance (in shares) 824,217 254,543 175,790
PRSU expense recognized during the year $ 4,016 $ 2,405 $ 1,054
Unamortized value of PRSUs $ 6,390 $ 4,520 $ 2,438
Weighted-average period expense is expected to be recognized 1 year 10 months 24 days 1 year 10 months 24 days 2 years 3 months 18 days