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Long-Term Debt (Parenthetical) (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
2010 Senior Notes due October 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument maturity date, month and year | 2020-10 | 2020-10 | 2020-10
2010 Senior Notes due October 2040 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument maturity date, month and year | 2040-10 | 2040-10 | 2040-10
2011 Senior Notes due November 2016 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument maturity date, month and year | 2016-11 | 2016-11 | 2016-11
2011 Senior Notes due November 2041 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument maturity date, month and year | 2041-11 | 2041-11 | 2041-11
2013 Senior Notes due March 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument maturity date, month and year | 2018-03 | 2018-03 | 2018-03
2013 Senior Notes due March 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument maturity date, month and year | 2023-03 | 2023-03 | 2023-03
2014 Senior Notes due May 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument maturity date, month and year | 2019-05 | 2019-05 | 2019-05

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- Definition Date when the debt instrument is scheduled to be fully repaid, in month-year format. + References No definition available. + 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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