Non-controlling Interest - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Significant Accounting Policies [Line Items]
Current portion of payable pursuant to tax receivable agreements	$ 11,331,000		$ 13,235,000
Amounts paid pursuant to Tax Receivable Agreements (TRAs)	1,931,000	$ 1,344,000
2014 Tax Returns
Significant Accounting Policies [Line Items]
Current portion of payable pursuant to tax receivable agreements	2,612,000
2015 Tax Returns
Significant Accounting Policies [Line Items]
Current portion of payable pursuant to tax receivable agreements	2,691,000
RIHI
Significant Accounting Policies [Line Items]
Liability representing the payments due pursuant to tax receivable agreements	96,905,000
Current portion of payable pursuant to tax receivable agreements	$ 11,331,000
RIHI and Western Presidio V, L.P.
Significant Accounting Policies [Line Items]
Percentage of cash savings in federal, state and local taxes to be paid in cash under tax receivable agreements	85.00%