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Derivatives - Effect of Cash Flow Hedging Instruments on Other Comprehensive Income (Loss) (Detail) (Derivatives Designated As Cash Flow Hedges [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Effect of cash flow hedging instruments on other comprehensive income (loss) $ 1,796us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet $ 12,687us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet $ (7,197)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
Foreign Exchange Forward Contracts [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Effect of cash flow hedging instruments on other comprehensive income (loss) (8,585)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= q_DerivativesDesignatedAsCashFlowHedgesMember
3,485us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= q_DerivativesDesignatedAsCashFlowHedgesMember
2,327us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
/ us-gaap_HedgingDesignationAxis
= q_DerivativesDesignatedAsCashFlowHedgesMember
Interest Rate Swaps [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Effect of cash flow hedging instruments on other comprehensive income (loss) $ 10,381us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= q_DerivativesDesignatedAsCashFlowHedgesMember
$ 9,202us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= q_DerivativesDesignatedAsCashFlowHedgesMember
$ (9,524)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_HedgingDesignationAxis
= q_DerivativesDesignatedAsCashFlowHedgesMember