Investment in Non-Consolidated Joint Venture - Components of Joint Venture Investment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Schedule of Equity Method Investments [Line Items]
Beginning Balance			$ 38,462
Our share of cumulative earnings	$ 1,343	$ 1,021	2,743	$ 1,882
Ending Balance	41,205		41,205
Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Beginning Balance			38,462
Our share of cumulative earnings			3,004
Accretion of basis difference from purchase accounting			(261)
Ending Balance	$ 41,205		$ 41,205