Net Income (Loss) Per Share Attributable to Class A Common Shareholders - Schedule of Calculations of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator:
Net income (loss) attributable to holders of shares of Class A common stock—basic	$ 13,570	$ 33,325
Class A Common Stock
Numerator:
Net income (loss) attributable to holders of shares of Class A common stock—basic	13,570	33,325
Add (deduct) dilutive effect of:
Net income (loss) attributable to holders of shares of Class A common stock—diluted	$ 13,570	$ 33,325
Denominator:
Weighted average shares of Class A common stock outstanding—basic	48,309,358	36,169,566
Add (deduct) dilutive effect of:
Weighted average number of incremental shares issuable from unvested restricted stock, RSUs and stock options, as calculated using the treasury stock method	6,798,977	8,426,968
Weighted average shares of Class A common stock outstanding—diluted	55,108,335	44,596,534
Net income (loss) per share attributable to holders of shares of Class A common stock
Basic (in dollars per share)	$ 0.28	$ 0.92
Diluted (in dollars per share)	$ 0.25	$ 0.75