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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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