Acquisitions (Summary of Consideration Transferred to Acquire Businesses and Amounts of Identifiable Assets Acquired, Liabilities Assumed and Noncontrolling Interests) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair value of consideration transferred:
Cash	$ 230,517	$ 126,181	$ 64,156
Debt assumed	111,324
Notes issued to sellers	6,091
Contingent consideration	815	42,538	40
Total fair value of consideration transferred	348,747	168,719	64,196
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Accounts receivable	12,571	3,785	211
Other current assets	1,440	111	317
Property and equipment	208,363	140,412	12,775
Long-term franchise agreements and contracts	16,462	369	1,043
Indefinite-lived intangibles	1,256
Customer lists	12,504	9,420	13,024
Permits	37,071
Other long-term assets	2,738
Deferred revenue	(5,056)	(427)	(539)
Accounts payable	(7,515)		(735)
Accrued liabilities	(1,822)	(1,749)	(1,034)
Other long-term liabilities	(19,998)	(1,980)	(767)
Deferred income taxes	(50,089)
Total identifiable net assets	207,925	149,941	24,295
Goodwill	$ 140,822	$ 18,778	$ 39,901