Investment in Non-Consolidated Joint Venture - Components of Joint Venture Investment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of Equity Method Investments [Line Items]
Beginning Balance			$ 34,703
Capital contributed to the joint venture			(869)	$ (2,538)
Our share of cumulative earnings	$ 621	$ 225	2,503	$ 225
Ending Balance	37,088		37,088
Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Beginning Balance			34,703
Capital contributed to the joint venture			1,999
Our share of cumulative earnings			3,957
Dividends Received			(2,868)
Accretion of basis difference from purchase accounting			(703)
Ending Balance	$ 37,088		$ 37,088