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Redemption Price of Notes Plus Accrued and Unpaid Interest Thereon to Redemption Date (Detail) - Senior Notes [Member] | 12 Months Ended
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Dec. 31, 2015
5½% Senior Notes [Member] | 2017 [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Redemption Price, Percentage | 102.75%
5½% Senior Notes [Member] | 2018 [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Redemption Price, Percentage | 101.375%
5½% Senior Notes [Member] | 2019 and thereafter [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%
5% Senior Notes due 2020 [Member] | 2016 [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Redemption Price, Percentage | 102.50%
5% Senior Notes due 2020 [Member] | 2017 [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Redemption Price, Percentage | 101.25%
5% Senior Notes due 2020 [Member] | 2018 and thereafter [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%

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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 Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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