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Employee Benefit Plans - Summary of Amounts Recognized in Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]        
Beginning balance     $ (5,021)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax  
Reclassification adjustments included in pension expense:        
Amortization   468us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax 655us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax  
Amounts arising during the period:        
Tax rate adjustments 8,100us-gaap_IncomeTaxExpenseBenefit 150,056us-gaap_IncomeTaxExpenseBenefit 95,965us-gaap_IncomeTaxExpenseBenefit 93,364us-gaap_IncomeTaxExpenseBenefit
Actuarial changes in benefit obligation   (7,237)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax 2,304us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax  
Ending balance   (8,857)q_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTaxAttributableToParent (2,088)q_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTaxAttributableToParent  
Prior Service Costs [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Beginning balance     (443)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember
 
Reclassification adjustments included in pension expense:        
Amortization   107us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember
336us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember
 
Amounts arising during the period:        
Ending balance     (107)q_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTaxAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetPriorServiceCostCreditMember
 
Actuarial Net (Gain) Loss [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Beginning balance     (7,792)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= q_AccumulatedDefinedBenefitPlansAdjustmentActuarialNetGainLossMember
 
Reclassification adjustments included in pension expense:        
Amortization   636us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= q_AccumulatedDefinedBenefitPlansAdjustmentActuarialNetGainLossMember
708us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= q_AccumulatedDefinedBenefitPlansAdjustmentActuarialNetGainLossMember
 
Amounts arising during the period:        
Actuarial changes in benefit obligation   (10,218)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= q_AccumulatedDefinedBenefitPlansAdjustmentActuarialNetGainLossMember
2,147us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= q_AccumulatedDefinedBenefitPlansAdjustmentActuarialNetGainLossMember
 
Ending balance   (14,519)q_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTaxAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= q_AccumulatedDefinedBenefitPlansAdjustmentActuarialNetGainLossMember
(4,937)q_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTaxAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= q_AccumulatedDefinedBenefitPlansAdjustmentActuarialNetGainLossMember
 
Deferred Income Taxes [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Beginning balance     3,214us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= q_AccumulatedDefinedBenefitPlansAdjustmentDeferredIncomeTaxesMember
 
Reclassification adjustments included in pension expense:        
Amortization   (275)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= q_AccumulatedDefinedBenefitPlansAdjustmentDeferredIncomeTaxesMember
(389)us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= q_AccumulatedDefinedBenefitPlansAdjustmentDeferredIncomeTaxesMember
 
Amounts arising during the period:        
Tax rate adjustments     (26)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementEquityComponentsAxis
= q_AccumulatedDefinedBenefitPlansAdjustmentDeferredIncomeTaxesMember
 
Actuarial changes in benefit obligation   2,981us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= q_AccumulatedDefinedBenefitPlansAdjustmentDeferredIncomeTaxesMember
157us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax
/ us-gaap_StatementEquityComponentsAxis
= q_AccumulatedDefinedBenefitPlansAdjustmentDeferredIncomeTaxesMember
 
Ending balance   $ 5,662q_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTaxAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= q_AccumulatedDefinedBenefitPlansAdjustmentDeferredIncomeTaxesMember
$ 2,956q_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTaxAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= q_AccumulatedDefinedBenefitPlansAdjustmentDeferredIncomeTaxesMember