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Quarterly Financial Information (Unaudited) (Parenthetical) (Detail) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2013
Dec. 31, 2014
Quarterly Financial Information Disclosure [Line Items]                
Tax Credit Carryforward, Valuation Allowance $ 5,200,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ (2,700,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ 16,300,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ 25,800,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ 13,600,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount      
Deferred debt issuance cost written off with previous credit facility       0us-gaap_WriteOffOfDeferredDebtIssuanceCost 3,901,000us-gaap_WriteOffOfDeferredDebtIssuanceCost 0us-gaap_WriteOffOfDeferredDebtIssuanceCost    
Interest Expense                
Quarterly Financial Information Disclosure [Line Items]                
Deferred debt issuance cost written off with previous credit facility             3,900,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InterestExpenseMember		  
Other Nonoperating Income (Expense)                
Quarterly Financial Information Disclosure [Line Items]                
Gain on sale of investment in Humedica, Inc.               4,700,000us-gaap_RealizedInvestmentGainsLosses
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherNonoperatingIncomeExpenseMember
Gain from the remeasurement of interest in dbMotion in connection with the acquisition               $ 3,300,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherNonoperatingIncomeExpenseMember