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Borrowings (Schedule of Borrowings 1) (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
4.2% Senior Notes, due December 2021 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.20% |
Senior Notes, maturity date | 2021-12 | 2021-12
4.5% Senior Notes, due December 2020 |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.50% |
Senior Notes, maturity date | 2020-12 | 2020-12

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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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