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Equity-Based Compensation - Summary of Restricted Stock Award and Restricted Stock Unit Activity (Detail)
shares in Thousands
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Service-Based Awards  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Outstanding RSAs/RSUs-Beginning Balance (shares) | shares 602
RSAs/RSUs granted (shares) | shares 392
RSAs/RSUs settled (shares) | shares (399)
RSAs/RSUs forfeited (shares) | shares (57)
Outstanding RSAs/RSUs-Ending Balance (shares) | shares 538
Vested RSAs/RSUs (shares) | shares 2
Nonvested RSAs/RSUs (shares) | shares 536
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted-Average Grant-Date Fair Value per RSA/RSU, Outstanding Beginning Balance (dollars per share) | $ / shares $ 17.06
Weighted-Average Grant-Date Fair Value per RSA/RSU, granted (dollars per share) | $ / shares 19.44
Weighted-Average Grant-Date Fair Value per RSA/RSU, settled (dollars per share) | $ / shares 17.46
Weighted-Average Grant-Date Fair Value per RSA/RSU, forfeited (dollars per share) | $ / shares 18.15
Weighted-Average Grant-Date Fair Value per RSA/RSU, Outstanding Ending Balance (dollars per share) | $ / shares 18.39
Vested RSAs/RSUs (dollars per share) | $ / shares 21.66
Nonvested RSAs/RSUs (dollars per share) | $ / shares $ 18.38
Performance Vesting  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Outstanding RSAs/RSUs-Beginning Balance (shares) | shares 153
RSAs/RSUs granted (shares) | shares 56
RSAs/RSUs settled (shares) | shares (153)
RSAs/RSUs forfeited (shares) | shares (8)
Outstanding RSAs/RSUs-Ending Balance (shares) | shares 48
Vested RSAs/RSUs (shares) | shares 0
Nonvested RSAs/RSUs (shares) | shares 48
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted-Average Grant-Date Fair Value per RSA/RSU, Outstanding Beginning Balance (dollars per share) | $ / shares $ 17.45
Weighted-Average Grant-Date Fair Value per RSA/RSU, granted (dollars per share) | $ / shares 19.52
Weighted-Average Grant-Date Fair Value per RSA/RSU, settled (dollars per share) | $ / shares 17.45
Weighted-Average Grant-Date Fair Value per RSA/RSU, forfeited (dollars per share) | $ / shares 19.52
Weighted-Average Grant-Date Fair Value per RSA/RSU, Outstanding Ending Balance (dollars per share) | $ / shares 19.52
Vested RSAs/RSUs (dollars per share) | $ / shares 0.00
Nonvested RSAs/RSUs (dollars per share) | $ / shares $ 19.52
Market Vesting  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Outstanding RSAs/RSUs-Beginning Balance (shares) | shares 211
RSAs/RSUs granted (shares) | shares 204
RSAs/RSUs settled (shares) | shares (41)
RSAs/RSUs forfeited (shares) | shares (47)
Outstanding RSAs/RSUs-Ending Balance (shares) | shares 327
Vested RSAs/RSUs (shares) | shares 0
Nonvested RSAs/RSUs (shares) | shares 327
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted-Average Grant-Date Fair Value per RSA/RSU, Outstanding Beginning Balance (dollars per share) | $ / shares $ 16.46
Weighted-Average Grant-Date Fair Value per RSA/RSU, granted (dollars per share) | $ / shares 17.41
Weighted-Average Grant-Date Fair Value per RSA/RSU, settled (dollars per share) | $ / shares 20.76
Weighted-Average Grant-Date Fair Value per RSA/RSU, forfeited (dollars per share) | $ / shares 16.19
Weighted-Average Grant-Date Fair Value per RSA/RSU, Outstanding Ending Balance (dollars per share) | $ / shares 16.54
Vested RSAs/RSUs (dollars per share) | $ / shares 0.00
Nonvested RSAs/RSUs (dollars per share) | $ / shares $ 16.54