Operations by Geographic Location - Operations Within Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified
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3 Months Ended |
12 Months Ended |
Dec. 31, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Geographic Information [Line Items] |
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Sales Revenue Services Net |
$ 1,064,045us-gaap_SalesRevenueServicesNet |
$ 1,061,013us-gaap_SalesRevenueServicesNet |
$ 1,035,476us-gaap_SalesRevenueServicesNet |
$ 1,005,288us-gaap_SalesRevenueServicesNet |
$ 1,003,940us-gaap_SalesRevenueServicesNet |
$ 932,727us-gaap_SalesRevenueServicesNet |
$ 944,238us-gaap_SalesRevenueServicesNet |
$ 927,435us-gaap_SalesRevenueServicesNet |
$ 4,165,822us-gaap_SalesRevenueServicesNet |
$ 3,808,340us-gaap_SalesRevenueServicesNet |
$ 3,692,298us-gaap_SalesRevenueServicesNet |
Reimbursed expenses |
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1,294,176us-gaap_ReimbursementRevenue |
1,291,205us-gaap_ReimbursementRevenue |
1,173,215us-gaap_ReimbursementRevenue |
Total revenues |
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5,459,998us-gaap_Revenues |
5,099,545us-gaap_Revenues |
4,865,513us-gaap_Revenues |
Americas [Member] |
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Geographic Information [Line Items] |
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Sales Revenue Services Net |
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1,783,999us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember |
1,532,974us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember |
1,469,558us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember |
Americas [Member] | United States [Member] |
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Geographic Information [Line Items] |
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Sales Revenue Services Net |
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1,589,402us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember / us-gaap_SubsegmentsAxis = country_US |
1,351,160us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember / us-gaap_SubsegmentsAxis = country_US |
1,288,990us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember / us-gaap_SubsegmentsAxis = country_US |
Americas [Member] | Other [Member] |
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Geographic Information [Line Items] |
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Sales Revenue Services Net |
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194,597us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember / us-gaap_SubsegmentsAxis = q_OtherStateMember |
181,814us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember / us-gaap_SubsegmentsAxis = q_OtherStateMember |
180,568us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember / us-gaap_SubsegmentsAxis = q_OtherStateMember |
Europe and Africa [Member] |
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Geographic Information [Line Items] |
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Sales Revenue Services Net |
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1,523,538us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = q_EuropeAndAfricaMember |
1,501,504us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = q_EuropeAndAfricaMember |
1,430,917us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = q_EuropeAndAfricaMember |
Europe and Africa [Member] | Other [Member] |
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Geographic Information [Line Items] |
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Sales Revenue Services Net |
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1,121,354us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = q_EuropeAndAfricaMember / us-gaap_SubsegmentsAxis = q_OtherStateMember |
1,139,262us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = q_EuropeAndAfricaMember / us-gaap_SubsegmentsAxis = q_OtherStateMember |
1,086,065us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = q_EuropeAndAfricaMember / us-gaap_SubsegmentsAxis = q_OtherStateMember |
Europe and Africa [Member] | United Kingdom [Member] |
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Geographic Information [Line Items] |
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Sales Revenue Services Net |
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402,184us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = q_EuropeAndAfricaMember / us-gaap_SubsegmentsAxis = country_GB |
362,242us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = q_EuropeAndAfricaMember / us-gaap_SubsegmentsAxis = country_GB |
344,852us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = q_EuropeAndAfricaMember / us-gaap_SubsegmentsAxis = country_GB |
Asia-Pacific [Member] |
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Geographic Information [Line Items] |
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Sales Revenue Services Net |
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858,285us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember |
773,862us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember |
791,823us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember |
Asia-Pacific [Member] | Other [Member] |
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Geographic Information [Line Items] |
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Sales Revenue Services Net |
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386,454us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember / us-gaap_SubsegmentsAxis = q_OtherStateMember |
334,980us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember / us-gaap_SubsegmentsAxis = q_OtherStateMember |
291,543us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember / us-gaap_SubsegmentsAxis = q_OtherStateMember |
Asia-Pacific [Member] | Japan [Member] |
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Geographic Information [Line Items] |
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Sales Revenue Services Net |
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$ 471,831us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember / us-gaap_SubsegmentsAxis = country_JP |
$ 438,882us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember / us-gaap_SubsegmentsAxis = country_JP |
$ 500,280us-gaap_SalesRevenueServicesNet / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember / us-gaap_SubsegmentsAxis = country_JP |