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Related Party Transactions - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related Party Transaction [Line Items]        
Business related travel expense   $ 1,800,000us-gaap_TravelAndEntertainmentExpense $ 2,700,000us-gaap_TravelAndEntertainmentExpense $ 4,200,000us-gaap_TravelAndEntertainmentExpense
Payment of fee for modification of agreement relating to business usage of airplane 1,500,000q_PaymentOfAgreementModificationFee      
Maximum [Member]        
Related Party Transaction [Line Items]        
Maximum future annual reimbursements 2,500,000q_ReimbursementOfTravelExpensesPayable
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
     
Affiliated Entity [Member]        
Related Party Transaction [Line Items]        
Fee for services   2,300,000us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
772,000us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
 
Sublease income   76,000us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
   
Affiliated Entity [Member] | Maximum [Member] | Scenario, Forecast [Member]        
Related Party Transaction [Line Items]        
Fee for services   $ 416,000us-gaap_RevenueFromRelatedParties
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
$ 19,200,000us-gaap_RevenueFromRelatedParties
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember