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Asset-Backed Financing (Narrative) (Detail)
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2017
USD ($)
Jan. 31, 2017
USD ($)
Jun. 30, 2016
CAD
Jun. 25, 2017
USD ($)
Mar. 26, 2017
USD ($)
Jun. 26, 2016
USD ($)
Mar. 27, 2016
USD ($)
Jun. 25, 2017
USD ($)
Jun. 26, 2016
USD ($)
Jun. 30, 2017
CAD
Dec. 31, 2016
USD ($)
Dec. 14, 2016
USD ($)
Variable Interest Entity [Line Items]                        
Company issued secured notes, net of discount and issuance costs       $ 6,243,908,000   $ 6,040,836,000   $ 6,243,908,000 $ 6,040,836,000   $ 5,751,859,000  
Variable Interest Entity, Not Primary Beneficiary                        
Variable Interest Entity [Line Items]                        
Principal balance of finance receivable           301,800,000     301,800,000      
Asset-backed securitization debt | Variable Interest Entity, Not Primary Beneficiary                        
Variable Interest Entity [Line Items]                        
Principal balance of finance receivable           301,800,000     301,800,000      
Gain on sale of finance receivable           9,300,000            
Cash proceeds from sale of financial asset           312,600,000     312,600,000      
Unpaid principal balance of the retail motorcycle finance receivables       187,800,000       187,800,000        
Secured Debt                        
Variable Interest Entity [Line Items]                        
Company issued secured notes, net of discount and issuance costs       939,872,000   1,236,557,000   939,872,000 1,236,557,000   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 $ 24,000,000 $ 300,000,000                    
Line of credit, maximum borrowing capacity                       $ 900,000,000
Transfers on finance receivables $ 28,200,000 $ 333,400,000                    
Borrowings outstanding under conduit facility           0     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       14,200,000 $ 6,300,000 $ 31,400,000 $ 6,600,000 20,500,000 $ 38,000,000      
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       $ 22,200,000       $ 22,200,000        
Subsequent Event [Member] | 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 220,000,000