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Notes Payable and Other Noncurrent Liabilities - Payments Due under Notes Payable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
2017 $ 31,636  
2018 6,691  
2019 59,925  
Notes Payable, Total $ 98,252 $ 79,877