Quarterly report pursuant to Section 13 or 15(d)

Equity-Based Compensation - Summary of RSU Grants (Detail)

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Equity-Based Compensation - Summary of RSU Grants (Detail) - Restricted Stock Units
9 Months Ended
Sep. 30, 2015
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Granted on August 6, 2015 | shares 966,510
Ending Balance, Units | shares 966,510
Fair Value per unit, Granted on August 6, 2015 $ 13.23
Ending Balance, Range of Fair Value per unit $ 13.23