Segment Reporting Information by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue
Services													$ 260,747	$ 281,389	$ 305,118
Systems													99,090	80,902	182,266
Total revenue	93,194	[1]	95,332	[1]	86,221	[1]	85,090	[1]	78,622	96,033	92,842	94,794	359,837	362,291	487,384
Direct costs of revenue
Direct cost of services													142,231	156,285	178,317
Direct cost of systems													70,040	67,038	148,860
Total direct cost of revenue													212,271	223,323	327,177
Gross profit
Services gross profit													118,516	125,104	126,801
Systems gross profit													29,050	13,864	33,406
Total gross profit	38,626		35,906		38,235		34,799		31,797	35,783	35,907	35,481	147,566	138,968	160,207
Research and development expense													(41,723)	(34,308)	(36,602)
Sales and marketing expense													(25,994)	(28,495)	(30,753)
General and administrative expense													(50,820)	(54,689)	(54,277)
Depreciation and amortization of property and equipment													(13,032)	(14,853)	(14,245)
Amortization of acquired intangible assets													(3,797)	(4,570)	(4,374)
Impairment of goodwill and long-lived assets														(31,977)	(125,703)
Interest expense													(8,264)	(8,262)	(7,383)
Amortization of deferred financing fees													(1,005)	(3,403)	(757)
Gain (loss) on early retirement of debt														(178)	431
Other income (expense), net													(1,133)	(239)	(23)
Net income (loss) before income taxes													1,798	(42,006)	(113,479)
Income tax (expense) benefit													(3,529)	(16,591)	15,491
Net loss	(348)		(1,964)		1,058		(477)		(55,742)	(155)	(1,871)	(829)	(1,731)	(58,597)	(97,988)
Commercial Segment
Revenue
Services													154,388	150,311	159,054
Systems													25,114	19,749	23,690
Total revenue													179,502	170,060	182,744
Direct costs of revenue
Direct cost of services													60,241	63,984	70,438
Direct cost of systems													12,461	16,593	15,222
Total direct cost of revenue													72,702	80,577	85,660
Gross profit
Services gross profit													94,147	86,327	88,616
Systems gross profit													12,653	3,156	8,468
Total gross profit													106,800	89,483	97,084
Government Segment
Revenue
Services													106,359	131,078	146,064
Systems													73,976	61,153	158,576
Total revenue													180,335	192,231	304,640
Direct costs of revenue
Direct cost of services													81,990	92,301	107,879
Direct cost of systems													57,579	50,445	133,638
Total direct cost of revenue													139,569	142,746	241,517
Gross profit
Services gross profit													24,369	38,777	38,185
Systems gross profit													16,397	10,708	24,938
Total gross profit													$ 40,766	$ 49,485	$ 63,123

[1] 1 During the year ended December 31, 2014, we recognized a one-time favorable 2014 change in estimate of approximately $4,700 associated with our applications subscriber-based revenue.