Revenue Recognition - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Segment	Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Number of reporting segments affected | Segment	1
Franchise fees imposed by local governmental authorities	$ 115,399	$ 113,042
Franchise [Member]
Disaggregation of Revenue [Line Items]
Franchise fees imposed by local governmental authorities	$ 5,300	$ 5,300
Specified Contract Term and Non-Cancelable Service Period [Member] | Minimum [Member]
Disaggregation of Revenue [Line Items]
Contract term	1 year
Specified Contract Term and Non-Cancelable Service Period [Member] | Maximum [Member]
Disaggregation of Revenue [Line Items]
Contract term	10 years
Residential Contracts [Member]
Disaggregation of Revenue [Line Items]
Installation services, period of benefit	3 years
Other Contracts [Member] | Minimum [Member]
Disaggregation of Revenue [Line Items]
Installation services, period of benefit	1 year
Other Contracts [Member] | Maximum [Member]
Disaggregation of Revenue [Line Items]
Installation services, period of benefit	10 years