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New Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018 | Jan. 01, 2016
New Accounting Pronouncement Early Adoption [Line Items] |  |  |  |  |  |
Accumulated earnings | $ 3,591,753 |  | $ 3,443,007 |  |  |
Cumulative adjustment to accumulated earnings |  | $ 4,050,966 |  |  |  |
Distributions from equity method investments reclassified from cash flows from investing activities to cash flows from operating activities | $ 45,182 | 12,326 |  |  |  |
5.00% Senior Notes [Member] |  |  |  |  |  |
New Accounting Pronouncement Early Adoption [Line Items] |  |  |  |  |  |
Debt Instrument Interest Rate Stated Percentage | 5.00% |  |  |  |  |
ASU 2014-09 [Member] |  |  |  |  |  |
New Accounting Pronouncement Early Adoption [Line Items] |  |  |  |  |  |
Accumulated earnings |  |  |  |  | $ 3,348,385 |
Cumulative adjustment to accumulated earnings | $ 4,529,998 | 3,933,292 |  |  |  |
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 |  | 9,100 |  |  |  |
Cash paid for acquisitions reclassified from cash used in investing activities to cash used in financing activities |  | 8,300 |  |  |  |
Accounting Standards Update 2016-15 | 5.00% Senior Notes [Member] |  |  |  |  |  |
New Accounting Pronouncement Early Adoption [Line Items] |  |  |  |  |  |
Deb instrument, redemption premium | $ 20,000 |  |  |  |  |
Debt Instrument Interest Rate Stated Percentage | 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 |  | $ 1,069,762 | $ 5,600 | $ 1,100 |  |

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