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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
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Fair value of consideration transferred:    
Cash $ 344,265  
Notes issued to sellers 13,460  
Consideration transferred 414,682  
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:    
Accounts receivable 12,998  
Prepaid expenses and other current assets 2,305  
Property and equipment 138,831  
Deferred revenue (3,176)  
Deferred income taxes (59,584)  
Total identifiable net assets 152,769  
Goodwill 261,913 $ 1,766
Accounts Payable and Accrued Liabilities [Member]    
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:    
Accounts payable and accrued liabilities (13,345)  
Debt [Member]    
Fair value of consideration transferred:    
Liabilities incurred 56,957  
Contingent Consideration [Member]    
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:    
Other long-term liabilities (15)  
Other Acquisition [Member]    
Fair value of consideration transferred:    
Cash   3,555
Consideration transferred   3,555
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:    
Property and equipment   1,079
Deferred revenue   (383)
Other long-term liabilities   (163)
Total identifiable net assets   1,789
Goodwill   1,766
Other Acquisition [Member] | Contingent Consideration [Member]    
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:    
Other long-term liabilities   (220)
Contracts [Member]    
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:    
Intangibles 31,700  
Customer Lists [Member]    
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:    
Intangibles 15,794  
Customer Lists [Member] | Other Acquisition [Member]    
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:    
Intangibles   $ 1,476
Other Intangibles    
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:    
Intangibles $ 27,261