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Fair Value of Financial Instruments (Carrying Values and Fair Values of Debt Instruments) (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |
Carrying value of senior notes |  | $ 3,763,330 | $ 3,926,321
Senior Notes [Member] | Senior Notes due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of senior notes |  |  | 50,000
Fair value of senior notes | [1] |  | 50,223
Senior note year due |  | 2018 |
Senior Notes [Member] | Senior Notes due 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of senior notes |  | $ 175,000 | 175,000
Fair value of senior notes | [1] | $ 178,150 | 182,547
Senior note year due |  | 2019 |
Senior Notes [Member] | Senior Notes due 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of senior notes |  | $ 100,000 | 100,000
Fair value of senior notes | [1] | $ 101,780 | 104,985
Senior note year due |  | 2021 |
Senior Notes [Member] | New Senior Notes due 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of senior notes |  | $ 150,000 | 150,000
Fair value of senior notes | [1] | $ 144,299 | 146,855
Senior note year due |  | 2021 |
Senior Notes [Member] | Senior Notes due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of senior notes |  | $ 125,000 | 125,000
Fair value of senior notes | [1] | $ 121,062 | 124,532
Senior note year due |  | 2022 |
Senior Notes [Member] | Senior Notes due 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of senior notes |  | $ 200,000 | 200,000
Fair value of senior notes | [1] | $ 188,988 | 194,660
Senior note year due |  | 2023 |
Senior Notes [Member] | Senior Notes due 2024 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of senior notes |  | $ 150,000 | 150,000
Fair value of senior notes | [1] | $ 143,651 | 149,133
Senior note year due |  | 2024 |
Senior Notes [Member] | Senior Notes due 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of senior notes |  | $ 375,000 | 375,000
Fair value of senior notes | [1] | $ 358,141 | 375,311
Senior note year due |  | 2025 |
Senior Notes [Member] | Senior Notes due 2026 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of senior notes |  | $ 400,000 | 400,000
Fair value of senior notes | [1] | $ 369,921 | 388,760
Senior note year due |  | 2026 |
Senior Notes [Member] | Senior Notes due 2027 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Carrying value of senior notes |  | $ 250,000 | 250,000
Fair value of senior notes | [1] | $ 236,409 | $ 250,029
Senior note year due |  | 2027 |
[1] | Senior Notes are classified as Level 2 within the fair value hierarchy. Fair value is based on quotes of bonds with similar ratings in similar industries.

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- Definition Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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