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Consolidated Quarterly Financial Data - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Business Acquisition, Transaction Costs | $ 500,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts |  |  | $ 500,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts | $ 100,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts | $ 200,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts | $ 600,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts | $ 2,400,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts | $ 13,600,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts | $ 1,700,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 59,000,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | $ 0 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | $ 0 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | $ 59,887,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |  |  |  |  |

X
- Definition Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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