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Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Fair Value Disclosures [Abstract]        
Cash and cash equivalents, Carrying amount $ 45,371 $ 52,347 $ 47,904 $ 45,570
Accounts receivable, net, Carrying amount 13,040 8,760    
Note receivable from affiliate, Carrying amount 10,700      
Accounts payable, Carrying amount 3,472 2,671    
Cash and cash equivalents, Fair value 45,371 52,347    
Accounts receivable, net, Fair value 13,040 8,760    
Note receivable from affiliate, Fair value 10,700      
Accounts payable, Fair value $ 3,472 $ 2,671