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Seasonal Financing - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Jun. 14, 2017
Debt Instrument [Line Items]      
Minimum outstanding borrowings, cross-default of long-term debt $ 25,000,000    
2017 Credit Facility      
Debt Instrument [Line Items]      
Debt-to-earnings before interest taxes depreciation amortization ratio maximum for covenant compliance   375.00%  
Indebtedness percentage maximum over net tangible assets 10.00%    
Secured pledge on domestic subsidiary equity percentage 100.00%    
Secured pledge on foreign tier 1 subsidiary equity percentage 66.00%    
Aggregate commitment under the credit facility $ 1,600,000,000.00    
Aggregate commitment under the credit facility, including the accordion feature $ 1,850,000,000.00    
2017 Credit Facility | Minimum      
Debt Instrument [Line Items]      
Commitment fee rate for unused commitments 0.08%    
2017 Credit Facility | Maximum      
Debt Instrument [Line Items]      
Commitment fee rate for unused commitments 0.25%    
2017 Credit Facility | Base Rate | Minimum      
Debt Instrument [Line Items]      
Interest rate margin for loans 0.00%    
2017 Credit Facility | Base Rate | Maximum      
Debt Instrument [Line Items]      
Interest rate margin for loans 0.75%    
2017 Credit Facility | LIBOR | Minimum      
Debt Instrument [Line Items]      
Interest rate margin for loans 0.88%    
2017 Credit Facility | LIBOR | Maximum      
Debt Instrument [Line Items]      
Interest rate margin for loans 1.75%    
2015 Credit Facility      
Debt Instrument [Line Items]      
Debt-to-earnings before interest taxes depreciation amortization ratio maximum for covenant compliance     350.00%
Fourth fiscal quarter of 2017 | 2017 Credit Facility      
Debt Instrument [Line Items]      
Debt-to-earnings before interest taxes depreciation amortization ratio maximum for covenant compliance 450.00%    
Each fiscal quarter after fourth fiscal quarter of 2017 | 2017 Credit Facility      
Debt Instrument [Line Items]      
Debt-to-earnings before interest taxes depreciation amortization ratio maximum for covenant compliance 425.00%    
Preceding four consecutive fiscal quarters | 2017 Credit Facility      
Debt Instrument [Line Items]      
Debt-to-earnings before interest taxes depreciation amortization ratio maximum for covenant compliance 375.00%