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Stock Based Compensation - Summary of Activity of Restricted Stock Units (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
RSU Activity, Weighted Average Grant Date Fair Value      
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
Non-performance Restricted Stock Units (RSUs) [Member]      
RSU Activity, Number of Awards      
Beginning balance (in shares) 186,753 9,888 8,885
Granted (in shares) 417,074 186,792 7,922
Vested (in shares) (13,787) (8,375) (6,919)
Forfeited (in shares) (55,556) (1,552) 0
Ending balance (in shares) 534,484 186,753 9,888
RSU Activity, Weighted Average Grant Date Fair Value      
Outstanding, Beginning balance (usd per share) $ 18.88 $ 22.25 $ 20.82
Granted (usd per share) 11.99 18.85 22.09
Vested (usd per share) 19.66 22.15 20.24
Forfeited (usd per share) 13.83 18.73 0.00
Outstanding, Ending balance (usd per share) $ 14.01 $ 18.88 $ 22.25
RSU expense recognized during the year $ 2,086 $ 930 $ 209
Unamortized value of PRSUs $ 4,666 $ 2,527 $ 100
Weighted-average period expense is expected to be recognized 2 years 8 months 12 days 3 years 1 year 3 months 18 days