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Compensation - Activity Associated with Restricted Stock Units (Detail) - Restricted Stock Units (RSUs) [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Units, Balance outstanding at beginning of period 4,478,000  
Number of Units, Granted 228,000  
Number of Units, Delivered units (1,117,000)  
Number of Units, Forfeited units (94,000)  
Number of Units, Balance outstanding at end of period 3,495,000 4,478,000
Weighted-Average Grant Date Fair Value, Balance outstanding at beginning of period $ 5.25  
Weighted-Average Grant Date Fair Value, Granted 4.32  
Weighted-Average Grant Date Fair Value, Delivered units 5.68  
Weighted-Average Grant Date Fair Value, Forfeited units 4.71  
Weighted-Average Grant Date Fair Value, Balance outstanding at end of period $ 5.07 $ 5.25
Fair Value, Balance outstanding at beginning of period $ 23,516  
Fair Value, Granted 986  
Fair Value, Delivered units (6,345)  
Fair Value, Forfeited units (443)  
Fair Value, Balance outstanding at end of period $ 17,714 $ 23,516
Weighted-Average Remaining Contractual Term (Years) 2 years 4 months 24 days 2 years 6 months