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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, 2019 | Apr. 16, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |
Carrying value of senior notes |  | $ 4,062,511 |  | $ 4,174,693
Senior notes | Senior Notes due 2019 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying value of senior notes | [1] | 175,000 |  | 175,000
Fair value of senior notes | [2] | $ 175,361 |  | $ 177,870
Interest rate |  | 5.25% |  | 5.25%
Senior note year due |  | 2019 |  |
Senior notes | Senior Notes due 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying value of senior notes |  | $ 100,000 |  | $ 100,000
Fair value of senior notes | [2] | $ 102,783 |  | $ 101,292
Interest rate |  | 4.64% |  | 4.64%
Senior note year due |  | 2021 |  |
Senior notes | New Senior Notes due 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying value of senior notes |  | $ 150,000 |  | $ 150,000
Fair value of senior notes | [2] | $ 149,210 |  | $ 144,305
Interest rate |  | 2.39% |  | 2.39%
Senior note year due |  | 2021 |  |
Senior notes | Senior Notes due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying value of senior notes |  | $ 125,000 |  | $ 125,000
Fair value of senior notes | [2] | $ 126,640 |  | $ 120,682
Interest rate |  | 3.09% |  | 3.09%
Senior note year due |  | 2022 |  |
Senior notes | Senior Notes due 2023 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying value of senior notes |  | $ 200,000 |  | $ 200,000
Fair value of senior notes | [2] | $ 200,664 |  | $ 188,363
Interest rate |  | 2.75% |  | 2.75%
Senior note year due |  | 2023 |  |
Senior notes | Senior Notes due 2024 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying value of senior notes |  | $ 150,000 |  | $ 150,000
Fair value of senior notes | [2] | $ 153,789 |  | $ 142,877
Interest rate |  | 3.24% |  | 3.24%
Senior note year due |  | 2024 |  |
Senior notes | Senior Notes due 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying value of senior notes |  | $ 375,000 |  | $ 375,000
Fair value of senior notes | [2] | $ 389,912 |  | $ 355,541
Interest rate |  | 3.41% |  | 3.41%
Senior note year due |  | 2025 |  |
Senior notes | Senior Notes due 2026 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying value of senior notes |  | $ 400,000 |  | $ 400,000
Fair value of senior notes | [2] | $ 407,943 |  | $ 367,143
Interest rate |  | 3.03% |  | 3.03%
Senior note year due |  | 2026 |  |
Senior notes | Senior Notes due 2027 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying value of senior notes |  | $ 250,000 |  | $ 250,000
Fair value of senior notes | [2] | $ 261,260 |  | $ 234,243
Interest rate |  | 3.49% |  | 3.49%
Senior note year due |  | 2027 |  |
Senior notes | Senior Notes due 2028 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying value of senior notes |  | $ 500,000 |  | $ 500,000
Fair value of senior notes | [2] | $ 567,850 |  | $ 506,100
Interest rate |  | 4.25% |  | 4.25%
Senior note year due |  | 2028 |  |
Senior notes | Senior Notes due 2029 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying value of senior notes |  | $ 500,000 |  |
Fair value of senior notes | [2] | $ 537,550 |  |
Interest rate |  | 3.50% | 3.50% |
Senior note year due |  | 2029 |  |
[1] | The Company has recorded the 2019 Senior Notes in long-term in the table above as the Company has the intent and ability to redeem the 2019 Senior Notes on November 1, 2019 using borrowings under the Credit Agreement
[2] | 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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