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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, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]      
Allowance for doubtful accounts, Beginning Balance $ 2,007us-gaap_AllowanceForDoubtfulAccountsReceivable $ 3,000us-gaap_AllowanceForDoubtfulAccountsReceivable  
Provision for doubtful accounts 1,825us-gaap_ProvisionForDoubtfulAccounts 2,144us-gaap_ProvisionForDoubtfulAccounts 4,263us-gaap_ProvisionForDoubtfulAccounts
Write-offs, net of recoveries (1,794)us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries (3,137)us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries  
Allowance for doubtful accounts, Ending Balance $ 2,038us-gaap_AllowanceForDoubtfulAccountsReceivable $ 2,007us-gaap_AllowanceForDoubtfulAccountsReceivable $ 3,000us-gaap_AllowanceForDoubtfulAccountsReceivable