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Stock-Based Compensation Plans and Employee Benefits - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Number of Options Outstanding, Beginning Balance 588 903 1,406
Number of Options, Granted 0 77 316
Number of Options, Spin-off adjustment 139    
Number of Options, Exercised (19) (26) (427)
Number of Options, Forfeited (262) (366) (392)
Number of Options Outstanding, Ending Balance 446 588 903
Number of Options exercisable 368 398 519
Weighted Average Exercise Price, Beginning balance $ 27.64 $ 38.32 $ 40.58
Weighted Average Exercise Price, Granted 0 28.86 33.48
Weighted Average Exercise Price, Spin-off adjustment 0    
Weighted Average Exercise Price, Exercised 9.73 14.66 23.24
Weighted Average Exercise Price, Forfeited 32.26 44.62 58.92
Weighted Average Exercise Price, Ending balance 25.71 27.64 38.32
Weighted Average Exercise Price, Options exercisable $ 25.86 $ 34.92 $ 40.98
Weighted-Average Remaining Contractual Term (Years), Ending Balance 5 years 2 months 12 days    
Weighted-Average Remaining Contractual Term (Years), Options exercisable 4 years 9 months 18 days 4 years 6 months 4 years 6 months
Aggregate Intrinsic Value, Ending balance $ 27    
Aggregate Intrinsic Value, Options exercisable $ 27 $ 196 $ 1,608