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Credit Arrangements - Summary of Credit Facilities (Detail)
In Millions, unless otherwise specified
0 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended 0 Months Ended
Dec. 31, 2014
First Lien Revolving Credit Facility [Member]
Dec. 31, 2014
First Lien Revolving Credit Facility [Member]
USD ($)
Dec. 31, 2014
First Lien Revolving Credit Facility [Member]
LIBOR [Member]
Dec. 31, 2014
Receivables Financing Facility [Member]
Dec. 31, 2014
Receivables Financing Facility [Member]
USD ($)
Dec. 31, 2014
General Banking Facility [Member]
Dec. 31, 2014
General Banking Facility [Member]
USD ($)
Dec. 31, 2014
General Banking Facility [Member]
EUR (€)
Dec. 31, 2014
General Banking Facility [Member]
Bank's Base Rate [Member]
Dec. 31, 2014
General Banking Facility [Member]
Bank's Base Rate [Member]
Dec. 31, 2014
Minimum [Member]
First Lien Revolving Credit Facility [Member]
LIBOR [Member]
Dec. 31, 2014
Minimum [Member]
Receivables Financing Facility [Member]
Dec. 31, 2014
Maximum [Member]
First Lien Revolving Credit Facility [Member]
LIBOR [Member]
Dec. 31, 2014
Maximum [Member]
Receivables Financing Facility [Member]
Credit Facility [Line Items]                            
Facility   $ 400.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= q_FirstLienRevolvingCreditFacilityMember
    $ 25.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= q_AccountsReceivableFinancingFacilityMember
  $ 15.6us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= q_BankCreditFacilityMember
€ 10.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= q_BankCreditFacilityMember
           
Interest Rate Description One month London Interbank Offer Rate ("LIBOR"), (0.17% at December 31, 2014) plus 2.50% to 2.75% depending upon the Company's total leverage ratio     LIBOR Market Index Rate, (0.17% at December 31, 2014) plus 0.85% to 1.35% depending upon the Company's debt rating   Bank's base rate (0.5% at December 31, 2014) plus 1%                
Rate     0.17%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_CreditFacilityAxis
= q_FirstLienRevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
  0.17%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_CreditFacilityAxis
= q_AccountsReceivableFinancingFacilityMember
        0.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_CreditFacilityAxis
= q_BankCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
       
Interest Rate spread on base rate                 1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= q_BankCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
  2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= q_FirstLienRevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
0.85%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= q_AccountsReceivableFinancingFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= q_FirstLienRevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
1.35%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= q_AccountsReceivableFinancingFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember