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Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning Balance $ 677 $ 572 $ 1,208
Provision for Credit Losses 915 680 968
Charge-offs (329) (575) (1,604)
Ending Balance $ 1,263 $ 677 $ 572