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Debt - Debt (Parenthetical) (Detail) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2015 | Dec. 31, 2014
Senior Notes, Interest at 6.125% Payable Semiannually, Principal Due on August 15, 2015 [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes interest rate | 6.125% | 6.125%
Senior note due date | Aug. 15, 2015 | Aug. 15, 2015
Senior Notes, Interest at 1.35% Payable Semiannually, Principal Due on December 1, 2017 [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes interest rate | 1.35% | 1.35%
Senior note due date | Dec. 01, 2017 | Dec. 01, 2017
Senior Notes, Interest at 2.6% Payable Semiannually, Principal Due on December 1, 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes interest rate | 2.60% | 2.60%
Senior note due date | Dec. 01, 2022 | Dec. 01, 2022
Senior Notes, Interest at 3.95% Payable Semiannually, Principal Due on December 1, 2042 [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes interest rate | 3.95% | 3.95%
Senior note due date | Dec. 01, 2042 | Dec. 01, 2042

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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