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Changes in Allowance for Doubtful Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Changes In Allowance For Doubtful Accounts [Line Items]      
Balance at beginning of year $ 2,058us-gaap_AllowanceForDoubtfulAccountsReceivable $ 858us-gaap_AllowanceForDoubtfulAccountsReceivable $ 1,233us-gaap_AllowanceForDoubtfulAccountsReceivable
Provision 178us-gaap_ProvisionForDoubtfulAccounts 908us-gaap_ProvisionForDoubtfulAccounts (153)us-gaap_ProvisionForDoubtfulAccounts
Write-offs, net of recoveries (1,189)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs 292us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (222)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Balance at end of year $ 1,047us-gaap_AllowanceForDoubtfulAccountsReceivable $ 2,058us-gaap_AllowanceForDoubtfulAccountsReceivable $ 858us-gaap_AllowanceForDoubtfulAccountsReceivable