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New Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018 | Jan. 01, 2016
New Accounting Pronouncement Early Adoption [Line Items] |  |  |  |  |  |  |  |
Accumulated earnings | $ 4,110,889 |  | $ 4,110,889 |  | $ 3,443,007 |  |  |
Cumulative adjustment to accumulated earnings | $ 5,092,208 | $ 4,493,760 | 14,572,398 | $ 12,735,501 |  |  |  |
Distributions from equity method investments reclassified from cash flows from investing activities to cash flows from operating activities |  |  | $ 262,670 | 155,937 |  |  |  |
5.00% Senior Notes [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncement Early Adoption [Line Items] |  |  |  |  |  |  |  |
Debt Instrument Interest Rate Stated Percentage | 5.00% |  | 5.00% |  | 5.00% |  |  |
Accounting Standards Update 2016-01 |  |  |  |  |  |  |  |
New Accounting Pronouncement Early Adoption [Line Items] |  |  |  |  |  |  |  |
Cumulative adjustment to accumulated earnings |  |  |  |  |  |  | $ 4,000 |
Accounting Standards Update 2016-15 |  |  |  |  |  |  |  |
New Accounting Pronouncement Early Adoption [Line Items] |  |  |  |  |  |  |  |
Distributions from equity method investments reclassified from cash flows from investing activities to cash flows from operating activities |  |  |  | 138,300 |  |  |  |
Cash paid for acquisitions reclassified from cash used in investing activities to cash used in financing activities |  |  |  | $ 23,300 |  |  |  |
Accounting Standards Update 2016-15 | 5.00% Senior Notes [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncement Early Adoption [Line Items] |  |  |  |  |  |  |  |
Deb instrument, redemption premium | $ 20,000 |  | $ 20,000 |  |  |  |  |
Debt Instrument Interest Rate Stated Percentage | 5.00% |  | 5.00% |  |  |  |  |
Adoption of new revenue recognition guidance [Member] | ASU 2014-09 [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncement Early Adoption [Line Items] |  |  |  |  |  |  |  |
Accumulated earnings |  |  |  |  | $ 94,622 |  |  | $ 87,900
Cumulative adjustment to accumulated earnings |  |  |  |  | $ 5,600 | $ 1,100 |  |

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