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Employee Benefit Plans - Schedule of Stock Options Outstanding and Exercisable (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Exercise Price Range $4.70 - $15.88 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options Outstanding 2,122,427us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
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Exercise Price Lower Range Outstanding $ 4.70us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= q_ExercisePriceRangeOneMember
Exercise Price Upper Range Outstanding $ 15.88us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
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= q_ExercisePriceRangeOneMember
Weighted Average Exercise Price Outstanding $ 13.37us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= q_ExercisePriceRangeOneMember
Weighted Average Remaining Life Outstanding (in years) 2 years 10 months 24 days
Number of Options Exercisable 2,122,427us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Weighted Average Exercise Price $ 13.37us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
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= q_ExercisePriceRangeOneMember
Exercise Price Range $17.11 - $23.83 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options Outstanding 2,290,827us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Exercise Price Lower Range Outstanding $ 17.11us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= q_ExercisePriceRangeTwoMember
Exercise Price Upper Range Outstanding $ 23.83us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
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= q_ExercisePriceRangeTwoMember
Weighted Average Exercise Price Outstanding $ 21.42us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
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= q_ExercisePriceRangeTwoMember
Weighted Average Remaining Life Outstanding (in years) 6 years 7 months 6 days
Number of Options Exercisable 1,220,640us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Weighted Average Exercise Price $ 20.84us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= q_ExercisePriceRangeTwoMember
Exercise Price Range $24.59 - $30.07 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options Outstanding 1,373,850us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= q_ExercisePriceRangeThreeMember
Exercise Price Lower Range Outstanding $ 24.59us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= q_ExercisePriceRangeThreeMember
Exercise Price Upper Range Outstanding $ 30.07us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= q_ExercisePriceRangeThreeMember
Weighted Average Exercise Price Outstanding $ 24.93us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= q_ExercisePriceRangeThreeMember
Weighted Average Remaining Life Outstanding (in years) 7 years 4 months 10 days
Number of Options Exercisable 592,500us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Weighted Average Exercise Price $ 24.80us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
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= q_ExercisePriceRangeThreeMember
Exercise Price Range $40.00 - $40.00 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options Outstanding 1,523,750us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= q_ExercisePriceRangeFourMember
Exercise Price Lower Range Outstanding $ 40.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= q_ExercisePriceRangeFourMember
Exercise Price Upper Range Outstanding $ 40.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= q_ExercisePriceRangeFourMember
Weighted Average Exercise Price Outstanding $ 40.00us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= q_ExercisePriceRangeFourMember
Weighted Average Remaining Life Outstanding (in years) 8 years 1 month 24 days
Number of Options Exercisable 282,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Weighted Average Exercise Price $ 40.00us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
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Exercise Price Range $42.74 - $53.26 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options Outstanding 1,551,700us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Exercise Price Lower Range Outstanding $ 42.74us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
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Exercise Price Upper Range Outstanding $ 53.26us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
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Weighted Average Exercise Price Outstanding $ 50.45us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
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Weighted Average Remaining Life Outstanding (in years) 9 years 1 month 6 days
Number of Options Exercisable 65,750us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Weighted Average Exercise Price $ 43.54us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
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= q_ExercisePriceRangeFiveMember
Exercise Price Range $57.00 - $57.95 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options Outstanding 262,400us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
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Exercise Price Lower Range Outstanding $ 57.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= q_ExercisePriceRangeSixMember
Exercise Price Upper Range Outstanding $ 57.95us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
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Weighted Average Exercise Price Outstanding $ 57.42us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
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Weighted Average Remaining Life Outstanding (in years) 9 years 10 months 28 days