Non-controlling Interest - Balance of Noncontrolling Interest (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended									12 Months Ended				3 Months Ended	0 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 07, 2013	Dec. 31, 2013 Noncontrolling Interest	Oct. 07, 2013 Reorganization Transaction And Ipo
Minority Interest [Line Items]
Non-controlling interest	$ (226,425)	$ (226,425)								$ (226,425)			$ 227,063		$ (155,823)
Reorganization Transactions whereby a portion of the Class A preferred units were converted to Common Units															82,500
Redemption of remaining Common Units held by Weston Presidio, and a portion of the Common Units held by RIHI	147,768														(147,768)
Offering expenses incurred by RMCO and deducted against proceeds received															(5,972)
RMCO equity held by the non-controlling unit holders as of October 7, 2013	226,425	226,425								226,425			(227,063)		155,823
Allocation of income subsequent to Reorganization Transactions and IPO	4,976	5,600	7,697	9,548	5,407	7,139	12,350	9,166	4,669	28,252	33,324	24,249		3,470
Distributions paid and payable to non-controlling unitholders	$ (2,832)										$ 6,215	$ 9,363