Net Income (Loss) Per Share Attributable to Class A Common Shareholders - Schedule of Calculations of Basic and Diluted Net Income (Loss) Per Share (Parenthetical) (Details) - Class A Common Stock - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share Basic [Line Items]
Number of shares of common stock to be issued upon exchange of a partnership unit	1		1
Fully diluted shares of common stock outstanding if all Class A partnership units were to be exchanged for common stock immediately following the reorganization	68,043,680	64,139,312	67,405,983	63,172,885
Restricted Stock and RSUs
Earnings Per Share Basic [Line Items]
Number of antidilutive securities excluded from calculation of diluted income (loss) per share	0	25	2,900	8