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Summary of Significant Accounting Policies - Reconciliation of Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]      
Beginning balance $ 6,460 $ 11,655 $ 6,544
Provision 992 2,143 6,798
Write-off of uncollectible amounts, net of recoveries (1,807) (7,338) (1,687)
Ending balance $ 5,645 $ 6,460 $ 11,655