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Convertible Senior Notes (Parenthetical) (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2014 | Jul. 31, 2013
4.25% Convertible Senior Notes (due 2018) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, maturity year | 2018 | 2018 |  |
Debt instrument, interest rate | 4.25% | 4.25% |  | 4.25%
4.875% Convertible Senior Notes (due 2020) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, maturity year | 2020 | 2020 |  |
Debt instrument, interest rate | 4.875% | 4.875% | 4.875% |

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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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