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Equity-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
8 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Number of Options, Outstanding, Beginning Balance   456,374
Number of options, Granted 0 2,614,707
Number of options, Exercised   (257)
Number of options, Forfeited   (30,610)
Number of Options, Outstanding, Ending Balance   3,040,214
Number of Options, Exercisable   142,964
Weighted Average Exercise Price per Share, Outstanding, Beginning Balance   $ 6.04
Weighted Average Exercise Price per Share, Granted   8.83
Weighted Average Exercise Price per Share, Exercised   5.81
Weighted Average Exercise Price per Share, Forfeited   15.34
Weighted Average Exercise Price per Share, Outstanding, Ending Balance   8.35
Weighted Average Exercise Price per Share, Exercisable   $ 6.03
Weighted Average Remaining Contractual Term, Outstanding   9 years 1 month 6 days
Weighted Average Remaining Contractual Term, Exercisable   8 years 9 months 18 days
Aggregate Intrinsic Value, Outstanding   $ 14,482
Aggregate Intrinsic Value, Exercisable   $ 1,012