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Asset-Backed Financing (Narrative) (Detail)
1 Months Ended 3 Months Ended
Jan. 31, 2017
USD ($)
Jun. 30, 2016
CAD
Mar. 26, 2017
USD ($)
Mar. 27, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 14, 2016
USD ($)
Variable Interest Entity [Line Items]            
Company issued secured notes, net of discount and issuance costs     $ 6,017,858,000 $ 6,242,693,000 $ 5,751,859,000  
Asset-backed securitization debt | Variable Interest Entity, Not Primary Beneficiary            
Variable Interest Entity [Line Items]            
Principal balance of finance receivable     301,800,000      
Gain on sale of finance receivable     9,300,000      
Cash proceeds from sale of financial asset     312,600,000      
Unpaid principal balance of the retail motorcycle finance receivables     212,800,000      
Secured Debt            
Variable Interest Entity [Line Items]            
Company issued secured notes, net of discount and issuance costs     1,112,592,000 1,440,040,000 945,613,000  
Secured Debt | Asset-Backed U.S. Commercial Paper Conduit Facility VIE [Member] | SPEs | U.S. Line of Credit            
Variable Interest Entity [Line Items]            
Company issued secured notes $ 300,000,000          
Line of credit, maximum borrowing capacity           $ 900,000,000
Transfers on finance receivables $ 333,400,000          
Borrowings outstanding under conduit facility       0 $ 0  
Debt instrument, term 5 years          
Secured Debt | Asset-Backed U.S. Commercial Paper Conduit Facility VIE, Facility Two [Member] | SPEs | U.S. Line of Credit            
Variable Interest Entity [Line Items]            
Line of credit, maximum borrowing capacity           300,000,000
Secured Debt | Asset-Backed U.S. Commercial Paper Conduit Facility VIE, Facility One [Member] | SPEs | U.S. Line of Credit            
Variable Interest Entity [Line Items]            
Line of credit, maximum borrowing capacity           $ 600,000,000
Secured Debt | Asset-backed Canadian commercial paper conduit facility | Variable Interest Entity, Not Primary Beneficiary            
Variable Interest Entity [Line Items]            
Transfers on finance receivables     6,300,000 $ 6,600,000    
Secured Debt | Asset-backed Canadian commercial paper conduit facility | Variable Interest Entity, Not Primary Beneficiary | Foreign Line of Credit            
Variable Interest Entity [Line Items]            
Line of credit, maximum borrowing capacity | CAD   CAD 240,000,000        
Debt instrument, term   5 years        
VIE, maximum loss exposure, amount     $ 22,600,000