Basis of Presentation - Statement of Operating Illustrating effect of Immaterial Revisions (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating expenses:
Cost of service revenue (exclusive of items shown below)	$ 53,396	$ 45,228	$ 108,250	$ 91,560
Cost of equipment revenue (exclusive of items shown below)	12,477	10,266	26,225	19,792
Engineering, design and development	24,718	18,816	46,366	37,432
Sales and marketing	16,750	13,263	31,492	25,077
General and administrative	22,388	21,373	43,377	41,609
Depreciation and amortization	24,906	20,813	49,263	39,590
Total operating expenses	$ 154,635	129,759	$ 304,973	255,060
Reported [Member]
Operating expenses:
Cost of service revenue (exclusive of items shown below)		44,382		89,929
Cost of equipment revenue (exclusive of items shown below)		10,173		19,631
Engineering, design and development		17,280		34,365
Sales and marketing		11,465		21,706
General and administrative		25,646		49,839
Depreciation and amortization		20,813		39,590
Total operating expenses		129,759		255,060
Revisions [Member] | Incentive Compensation Expense [Member]
Operating expenses:
Cost of service revenue (exclusive of items shown below)		573		1,118
Cost of equipment revenue (exclusive of items shown below)		75		125
Engineering, design and development		1,140		2,129
Sales and marketing		890		1,697
General and administrative		(2,678)		(5,069)
Revisions [Member] | Stock Based Compensation Expense [Member]
Operating expenses:
Cost of service revenue (exclusive of items shown below)		273		513
Cost of equipment revenue (exclusive of items shown below)		18		36
Engineering, design and development		396		938
Sales and marketing		908		1,674
General and administrative		$ (1,595)		$ (3,161)