Non-controlling Interest - Narrative (Details) - USD ($)				3 Months Ended
	May. 05, 2016	Mar. 23, 2016	Apr. 08, 2015	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Significant Accounting Policies [Line Items]
Distributions for taxes, non-controlling unitholders				$ 3,003,000	$ 2,076,000
Other distributions, non-controlling unitholders, paid				1,884,000
Other Distributions, non-controlling unitholders				0
Liability representing the payments due pursuant to tax receivable agreements				98,705,000
Current portion of payable pursuant to tax receivable agreements				7,148,000		$ 8,478,000
Amounts paid pursuant to Tax Receivable Agreements (TRAs)				1,344,000
Quarterly distribution
Significant Accounting Policies [Line Items]
Distributions declared to non-controlling unitholders		$ 1,884,000	$ 2,217,000
Quarterly distribution | Subsequent Event
Significant Accounting Policies [Line Items]
Distributions declared to non-controlling unitholders	$ 1,884,000
RIHI
Significant Accounting Policies [Line Items]
Amounts paid pursuant to Tax Receivable Agreements (TRAs)					$ 0
RIHI | 2014 Tax Returns
Significant Accounting Policies [Line Items]
Current portion of payable pursuant to tax receivable agreements				$ 2,570,000
RMCO, LLC
Significant Accounting Policies [Line Items]
Minority economic interest in RMCO (as a percent)				58.33%		58.33%
Non-controlling unitholders ownership of common units in RMCO as a percentage				41.67%		41.67%
RMCO, LLC | RIHI
Significant Accounting Policies [Line Items]
Non-controlling unitholders ownership of common units in RMCO as a percentage				41.67%		41.67%