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Summary of Significant Accounting Policies - Summary of Allowance for Doubtful Accounts Activity (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]      
Allowance for doubtful accounts, Beginning Balance $ 3,000 $ 1,500  
Provision for Doubtful Accounts 2,144 4,263 1,755
Write-offs, net of recoveries (3,137) (2,763)  
Allowance for doubtful accounts, Ending Balance $ 2,007 $ 3,000 $ 1,500