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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
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Fair value of consideration transferred:    
Cash $ 500,064 $ 394,002
Notes issued to sellers   13,460
Fair value of operations exchanged   81,097
Consideration transferred 565,074 545,517
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:    
Accounts receivable 12,817 19,312
Prepaid expenses and other current assets 2,355 4,336
Property and equipment 346,275 167,065
Indefinite-lived intangibles   5,830
Other assets 19 3,052
Deferred revenue (4,169) (9,657)
Other long-term liabilities (15,532) (1,080)
Deferred income taxes (391) (50,283)
Total identifiable net assets 395,124 236,486
Goodwill 169,950 309,031
Accounts Payable and Accrued Liabilities [Member]    
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:    
Accounts payable and accrued liabilities (3,982) (12,022)
Debt [Member]    
Fair value of consideration transferred:    
Liabilities incurred 65,010 56,958
Contingent Consideration [Member]    
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:    
Other long-term liabilities (11,669) (35)
Contracts [Member]    
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:    
Intangibles 10,888 54,674
Customer Lists [Member]    
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:    
Intangibles 27,330 28,033
Other Intangibles [Member]    
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:    
Intangibles $ 31,183 $ 27,261