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

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- Details
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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Period Type: | instant

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- Definition Amount of recoveries of receivables doubtful of collection that were previously charged off. + References No definition available. + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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