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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% |  |

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- Definition Debt to Earnings Before Interest Taxes Depreciation Amortization Ratio Maximum for Covenant Compliance1 + References No definition available. + Details
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- Definition Indebtedness Percentage Maximum over Net Tangible Assets + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility, including the accordion feature. + References No definition available. + Details
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- Definition Secured Pledge on Foreign Tier 1 Subsidiary Equity Percentage + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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