Non-Controlling Interests (Details)	1 Months Ended	3 Months Ended
	May 11, 2012	Mar. 31, 2014	Mar. 31, 2013
Noncontrolling Interest [Line Items]
Non-controlling common units of Operating Partnership, outstanding (in units)		524,941
Non-controlling ownership interest in Operating Partnership		1.60%
Units issued in connection with acquisition of assets and management platform (usd per unit)	175,000
Weighted-average share of net loss attributable to limited partners'		1.60%	1.00%
Assets and Management Platform from ARM
Noncontrolling Interest [Line Items]
Units issued in connection with acquisition of assets and management platform (usd per unit)		175,000
LTIP
Noncontrolling Interest [Line Items]
Total vested LTIP units		349,941