Net Income (Loss) Per Share/Unit - Weighted Average Unvested Shares/Incentive Units Excluded from the Computation of the Diluted Net Income (Loss) Per Share/Unit (Details) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Incentive Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net income (loss) per share/unit (in shares)	0	533,390	4,233,993
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net income (loss) per share/unit (in shares)	5,724,896	0	0
Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net income (loss) per share/unit (in shares)	30,383	0	0
Shares of Class B and Class C Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted net income (loss) per share/unit (in shares)	216,568,963	0	0