Non-controlling Interest - Narrative (Details) - USD ($)		9 Months Ended
	Nov. 04, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Significant Accounting Policies [Line Items]
Exercise of stock options, Shares		564,443
Other distributions, non-controlling unitholders		$ 38,813,000	$ 3,325,000
Other distributions, non-controlling unitholders, dividends		33,253,000
Other distributions, non-controlling unitholders, discretionary		5,560,000
Distributions for taxes, non-controlling unitholders			15,557,000
Liability representing the payments due pursuant to tax receivable agreements		67,418,000
Current portion of payable pursuant to tax receivable agreements		3,914,000		$ 3,914,000
Amounts paid pursuant to Tax Receivable Agreements (TRAs)		$ 0	$ 0
Quarterly distribution | Subsequent Event
Significant Accounting Policies [Line Items]
Distributions declared to non-controlling unitholders	$ 2,217,000
RMCO, LLC
Significant Accounting Policies [Line Items]
Minority economic interest in RMCO (as a percent)		41.03%		39.89%
Non-controlling unitholders ownership of common units in RMCO as a percentage		58.97%		60.11%
RMCO, LLC | RIHI Member
Significant Accounting Policies [Line Items]
Non-controlling unitholders ownership of common units in RMCO as a percentage		58.97%		60.11%
Class A common stock
Significant Accounting Policies [Line Items]
Exercise of stock options, Shares		564,443
Stock granted, net, shares		2,001
Class A common stock | Restricted stock
Significant Accounting Policies [Line Items]
Restricted stock, vested		5,154