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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 $ 500,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts     $ 500,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts $ 100,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts $ 200,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts $ 600,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts $ 2,400,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts $ 13,600,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts $ 1,700,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 59,000,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ 0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ 0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ 59,887,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount