Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets, gross carrying amount	$ 1,008,260	$ 1,003,240
Accumulated Amortization	(791,105)	(748,778)
Definite-lived intangible assets, net carrying amount	217,155	254,462
Indefinite-lived intangible assets:	623	623
Total intangible assets, gross carrying amount	1,008,883	1,003,863
Total intangible assets, net carrying amount	217,778	255,085
Customer contracts
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets, gross carrying amount	966,909	964,100
Accumulated Amortization	(757,039)	(717,648)
Definite-lived intangible assets, net carrying amount	$ 209,870	246,452
Estimated Useful Lives	10 years
2GIG 2.0 technology
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets, gross carrying amount	$ 17,000	17,000
Accumulated Amortization	(15,913)	(15,292)
Definite-lived intangible assets, net carrying amount	$ 1,087	1,708
Estimated Useful Lives	8 years
Other technology
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets, gross carrying amount	$ 4,725	2,917
Accumulated Amortization	(2,133)	(1,667)
Definite-lived intangible assets, net carrying amount	2,592	1,250
Space Monkey technology
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets, gross carrying amount	7,100	7,100
Accumulated Amortization	(6,283)	(5,756)
Definite-lived intangible assets, net carrying amount	$ 817	1,344
Estimated Useful Lives	6 years
Patents
Finite-Lived Intangible Assets [Line Items]
Definite-lived intangible assets, gross carrying amount	$ 12,526	12,123
Accumulated Amortization	(9,737)	(8,415)
Definite-lived intangible assets, net carrying amount	$ 2,789	3,708
Estimated Useful Lives	5 years
Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	2 years
Minimum | Other technology
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	5 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	10 years
Maximum | Other technology
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	7 years
IP addresses
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets:	$ 564	564
Domain names
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets:	$ 59	$ 59