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Equity-Based Compensation - Summary of Activity of RSAs and RSUs (Detail) - RSAs and RSUs [Member]
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Number of Shares  
Beginning balance | shares 560,015
Granted | shares 708,923
Conversion of the performance units upon completion of the spin-off | shares 423,510
Vested | shares (478,104)
Forfeited | shares (28,200)
Ending balance | shares 1,186,144
Weighted-Average Grant Date Fair Value  
Beginning balance | $ / shares $ 26.29
Granted | $ / shares 27.52
Conversion of the performance units upon completion of the spin-off | $ / shares 27.92
Vested | $ / shares 27.16
Forfeited | $ / shares 26.99
Ending balance | $ / shares $ 27.26