Non-controlling Interest - Additional Information (Detail) (USD $)	0 Months Ended			9 Months Ended							0 Months Ended	9 Months Ended	0 Months Ended
	Sep. 03, 2014	Jun. 05, 2014	Apr. 17, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Oct. 07, 2013	Nov. 06, 2014 Subsequent Event	Sep. 30, 2014 Noncontrolling interest	Dec. 31, 2013 Noncontrolling interest	May 20, 2014 Restricted Stock Units (RSUs)	Sep. 30, 2014 Common Class A	May 31, 2014 Common Class A Restricted Stock Units (RSUs)
Minority Interest [Line Items]
Percentage of common membership units in subsidiaries				39.53%		39.56%	39.56%
Total percentage of common stock units									60.47%	60.44%
Shares withheld and cancelled to cover employees statuary income tax requirements				30,519							30,519	30,519	30,519
Exercise of stock options, Shares				15,000								15,000
Distributions for Taxes, non-controlling unitholders				$ 15,557,000	$ 12,684,000
Other Distributions, non-controlling unitholders	1,108,000	1,108,000	1,108,000		8,000,000
Distributions declared to non-controlling unitholders								1,108,000
Distributions to noncontrolling unitholders description				Cash distributions were also required to be made to non-controlling unitholders in accordance with the Old RMCO, LLC Agreement in an amount equal to the lesser of (1) the amount of excess cash flow payment required to be paid as a mandatory prepayment pursuant to the Company’s previous senior secured credit facility and (2) $8,000,000.
Distribution declaration date				Nov. 06, 2014
Distribution payable date				Dec. 04, 2014
Tax benefit from tax receivable agreements				68,840,000
Current portion of payable to related parties pursuant to tax receivable agreements				902,000		902,000
Amounts paid to related parties pursuant to Tax Receivable Agreements (TRAs)				$ 0