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Supplemental Condensed Consolidating Financial Information and Other Collateral-Related Information - Additional Information (Detail) - USD ($) | Sep. 30, 2017 | Dec. 31, 2012
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Supplemental Condensed Consolidating Financial Information [Line Items] |  |
Ownership percentage held by parent | 100.00% |
Senior Unsecured Notes Due 2021 [Member] |  |
Supplemental Condensed Consolidating Financial Information [Line Items] |  |
Debt instrument, principal amount |  | $ 1,000,000,000
Debt instrument, stated interest |  | 6.25%

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- Definition Ownership percentage by parent. + References No definition available. + Details
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- Definition Supplemental condensed consolidating financial information. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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