Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Intangible Assets

The following is a summary of intangible assets at September 30, 2018 and December 31, 2017:  

	Estimated		September 30, 2018				December 31, 2017
	Life (Years)		Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Amortizable intangible assets:
Customer lists and contracts	7—10		$	582,156	$	510,291	$	586,055	$	505,778
Non-competition agreements	3—15			65,752		64,062		65,477		63,924
Site locations		15		2,091,912		1,404,915		2,072,059		1,372,954
Other	2—15			45,898		32,791		45,741		30,328
			$	2,785,718	$	2,012,059	$	2,769,332	$	1,972,984
Unamortizable intangible assets:
Goodwill			$	1,990,937	$	253,536	$	1,993,990	$	253,536