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Stock-based Compensation and Other Employee Benefits - Schedule of Non-Vested RSUs (Detail) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value [Roll Forward]      
Restricted stock granted (in usd per share) $ 30.93 $ 35.89 $ 43.35
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Non-vested, beginning balance (in shares) 2,279,000 2,083,000 1,814,000
Restricted stock granted (in shares) 2,048,000 1,467,000 1,359,000
Restricted stock vested (in shares) (639,000) (761,000) (787,000)
Restricted stock forfeited (in shares) (767,000) (510,000) (303,000)
Non-vested, ending balance (in shares) 2,921,000 2,279,000 2,083,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Weighted Average Grant Date Fair Value [Roll Forward]      
Beginning balance (in usd per share) $ 39.16 $ 43.34 $ 40.53
Restricted stock granted (in usd per share) 30.93 35.89 43.35
Restricted stock vested (in usd per share) 35.63 42.74 38.34
Restricted stock forfeited (in usd per share) 42.63 41.51 39.54
Ending balance (in usd per share) $ 33.25 $ 39.16 $ 43.34