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Investment in Non-Consolidated Joint Venture - Components of Joint Venture Investment (Detail) - Jun. 30, 2015 - USD ($) $ in Thousands	Total	Total
Schedule of Equity Method Investments [Line Items]
Beginning Balance		$ 34,703
Capital contributed to the joint venture		1,372
Our share of cumulative earnings	$ 1,021	1,882
Ending Balance	38,240	38,240
Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Beginning Balance		34,703
Capital contributed to the joint venture		1,372
Our share of cumulative earnings		2,758
Accretion of basis difference from purchase accounting		(593)
Ending Balance	$ 38,240	$ 38,240

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