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Long-Term Debt - Redemption Price, Percentage (Detail) | 12 Months Ended
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Dec. 31, 2017
6.125% Senior Subordinated Notes due 2027 [Member] |
Debt Instrument Redemption [Line Items] |
Redemption Price | 106.125%
6.125% Senior Subordinated Notes due 2027 [Member] | Beginning on March 15, 2022 [Member] |
Debt Instrument Redemption [Line Items] |
Redemption Price | 103.063%
6.125% Senior Subordinated Notes due 2027 [Member] | Beginning on March 15, 2023 [Member] |
Debt Instrument Redemption [Line Items] |
Redemption Price | 102.042%
6.125% Senior Subordinated Notes due 2027 [Member] | Beginning on March 15, 2024 [Member] |
Debt Instrument Redemption [Line Items] |
Redemption Price | 101.021%
6.125% Senior Subordinated Notes due 2027 [Member] | Beginning on March 15, 2025 and Thereafter [Member] |
Debt Instrument Redemption [Line Items] |
Redemption Price | 100.00%
5.0% Senior Subordinated Notes due 2023 [Member] | Beginning on May 15, 2018 [Member] |
Debt Instrument Redemption [Line Items] |
Redemption Price | 102.50%
5.0% Senior Subordinated Notes due 2023 [Member] | Beginning on May 15, 2019 [Member] |
Debt Instrument Redemption [Line Items] |
Redemption Price | 101.667%
5.0% Senior Subordinated Notes due 2023 [Member] | Beginning on May 15, 2020 [Member] |
Debt Instrument Redemption [Line Items] |
Redemption Price | 100.833%
5.0% Senior Subordinated Notes due 2023 [Member] | Beginning on May 15, 2021 and Thereafter [Member] |
Debt Instrument Redemption [Line Items] |
Redemption Price | 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=75038535&loc=d3e64711-112823 + Details
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