Equity Based Compensation - Schedule of Information about Unvested Class B and Class D Units (Details) - shares		3 Months Ended
	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested units outstanding, Beginning balance		7,030	9,340
Issuance of new grant of unvested shares	500
Unvested units, Vested		(2,210)	(2,210)
Unvested units outstanding, Ending balance	9,340	4,820	7,130
Class B Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested units outstanding, Beginning balance		5,230	6,940
Unvested units, Vested		(1,610)	(1,610)
Unvested units outstanding, Ending balance	6,940	3,620	5,330
Class D Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested units outstanding, Beginning balance		1,800	2,400
Unvested units, Vested		(600)	(600)
Unvested units outstanding, Ending balance	2,400	1,200	1,800