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Investment in Non-Consolidated Joint Venture - Components of Joint Venture Investment (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Schedule of Equity Method Investments [Line Items]    
Beginning Balance $ 38,462  
Our share of cumulative earnings 1,400 $ 861
Ending Balance 39,862  
Joint Venture [Member]    
Schedule of Equity Method Investments [Line Items]    
Beginning Balance 38,462  
Our share of cumulative earnings 1,547  
Accretion of basis difference from purchase accounting (147)  
Ending Balance $ 39,862