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Investments - Debt, Equity and Other Securities - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 15, 2011
Investments, Debt and Equity Securities [Abstract]        
Gains or losses from the sale of marketable equity securities $ 5,000,000us-gaap_GainLossOnInvestments $ 0us-gaap_GainLossOnInvestments $ 0us-gaap_GainLossOnInvestments  
Net of tax adjustment to unrealized gain (loss) on available-for-sale securities (170,000)q_OtherComprehensiveIncomeReclassificationAdjustmentForUnrealizedHoldingGainsLossesNetOfTax 3,500,000q_OtherComprehensiveIncomeReclassificationAdjustmentForUnrealizedHoldingGainsLossesNetOfTax 284,000q_OtherComprehensiveIncomeReclassificationAdjustmentForUnrealizedHoldingGainsLossesNetOfTax  
Loss on sale of marketable equity securities 0us-gaap_MarketableSecuritiesGainLoss 0us-gaap_MarketableSecuritiesGainLoss 0us-gaap_MarketableSecuritiesGainLoss  
Investment in joint venture       3,000,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Non controlling interest percentage in exchange of investment in joint venture 3.00%us-gaap_MinorityInterestOwnershipPercentageByParent 5.10%us-gaap_MinorityInterestOwnershipPercentageByParent    
Customer incentive 12,500,000q_CustomerIncentiveCosts      
Preferred stock acquired from Intarcia 5,000,000us-gaap_InvestmentOwnedAtCost      
Total customer incentive 7,100,000q_ContractedCustomerIncentives 10,700,000q_ContractedCustomerIncentives    
Preferred stock investment $ 5,000,000q_PurchaseOfPreferredStockAsAvailableForSaleInvestment