Related Party Transactions (Detail) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Prepaid expenses and other current assets		$ 16,988,000		$ 16,988,000		$ 11,449,000
Additional expenses incurred for other related-party transactions		300,000	$ 600,000	700,000	$ 1,200,000
Blackstone monitoring fee, a related party		2,000,000		2,000,000		4,800,000
Outstanding borrowings		3,172,849,000		3,172,849,000		3,045,195,000
Proceeds from capital contribution				0	0
Affiliated Entity | Minimum
Related Party Transaction [Line Items]
Annual monitoring base fee, minimum				2,700,000
Personal Use Of Corporate Jet
Related Party Transaction [Line Items]
Prepaid expenses and other current assets		300,000		300,000		1,800,000
Solar | Affiliated Entity
Related Party Transaction [Line Items]
Sublease and other administrative expenses		4,200,000	3,700,000	6,600,000	4,700,000
Blackstone Management Partners L.L.C. | Affiliated Entity
Related Party Transaction [Line Items]
Expenses incurred for services		1,000,000	1,000,000	2,000,000	2,100,000
Blackstone Management Partners L.L.C. | Blackstone Management Partners LLC Support and Services Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Maximum advisory fee obligation		1,500,000.0		1,500,000.0
Expenses related to support and services agreement		0	$ 0	0	$ 0
Blackstone Advisory Partners L.P. | Affiliated Entity
Related Party Transaction [Line Items]
Deferred financing costs	$ 1,200,000
Blackstone Advisory Partners L.P. | Term Loan | Affiliated Entity
Related Party Transaction [Line Items]
Outstanding borrowings		$ 82,200,000		$ 82,200,000		$ 75,100,000
Vivint Smart Home, Inc. | Affiliated Entity
Related Party Transaction [Line Items]
Proceeds from capital contribution	$ 4,700,000