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Basis of Presentation and Summary of Significant Accounting Policies - Fair Value of Financial Instruments (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Bad debt expense $ 3,347 $ 86  
Allowance for doubtful accounts, total $ 5,700   $ 2,600