Non-controlling Interest - Narrative (Details) - USD ($)		2 Months Ended		3 Months Ended		6 Months Ended		18 Months Ended
	Aug. 03, 2016	Jun. 02, 2016	Jun. 08, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Dec. 31, 2015
Significant Accounting Policies [Line Items]
Exercise of stock options, Shares						28,057
Other Distributions, non-controlling unitholders								$ 0
Liability representing the payments due pursuant to tax receivable agreements				$ 98,715,000		$ 98,715,000		98,715,000
Current portion of payable pursuant to tax receivable agreements				7,158,000		7,158,000		7,158,000	$ 8,478,000
Amounts paid pursuant to Tax Receivable Agreements (TRAs)						1,344,000
Quarterly distribution | Subsequent Event
Significant Accounting Policies [Line Items]
Distributions declared to non-controlling unitholders	$ 1,884,000,000
RIHI
Significant Accounting Policies [Line Items]
Amounts paid pursuant to Tax Receivable Agreements (TRAs)						1,344,000	$ 0
RIHI | 2014 Tax Returns
Significant Accounting Policies [Line Items]
Current portion of payable pursuant to tax receivable agreements				$ 2,580,000		$ 2,580,000		$ 2,580,000
RMCO, LLC
Significant Accounting Policies [Line Items]
Minority economic interest in RMCO (as a percent)				58.42%		58.42%		58.42%	58.33%
Weighted average ownership percentage				58.41%	40.81%	58.37%	40.40%
Non-controlling unitholders ownership of common units in RMCO as a percentage				41.58%		41.58%		41.58%	41.67%
Class A common stock | Quarterly distribution
Significant Accounting Policies [Line Items]
Distributions declared to non-controlling unitholders		$ 1,884,000	$ 2,217,000
Restricted Stock Units exchanged for Class A Common Stock [Member]
Significant Accounting Policies [Line Items]
Restricted stock, vested						33,288