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Acquisitions (Summary of Consideration Transferred to Acquire Businesses and Amounts of Identifiable Assets Acquired, Liabilities Assumed and Noncontrolling Interests) (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Fair value of consideration transferred:
Cash	$ 381,422	$ 485,519
Consideration transferred	431,996	550,529
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Accounts receivable	11,143	12,234
Prepaid expenses and other current assets	2,608	2,352
Property and equipment	195,728	340,922
Other assets	7
Deferred revenue	(8,504)	(3,646)
Other long-term liabilities	(8,706)	(4,408)
Deferred income taxes	(13,294)	(244)
Total identifiable net assets	207,644	384,820
Goodwill	224,352	165,709
Accounts Payable and Accrued Liabilities [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Accounts payable and accrued liabilities	(24,108)	(14,413)
Debt [Member]
Fair value of consideration transferred:
Liabilities incurred	50,574	65,010
Contingent Consideration [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Other long-term liabilities	(398)	(11,669)
Contracts [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Intangibles	9,820	9,787
Customer Lists [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Intangibles	25,513	23,905
Other Intangibles [Member]
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Intangibles	$ 17,835	$ 30,000

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