Goodwill Balances by Reporting Unit (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reporting Units For Goodwill Impairment Testing [Line Items]
Goodwill	$ 104,241	$ 104,241	$ 112,450
Platforms and applications
Reporting Units For Goodwill Impairment Testing [Line Items]
Goodwill	27,912	27,912	36,121
Safety and Security Group
Reporting Units For Goodwill Impairment Testing [Line Items]
Goodwill	22,033	22,033
Government Solutions Group
Reporting Units For Goodwill Impairment Testing [Line Items]
Goodwill	26,141	26,141
Cyber Intelligence
Reporting Units For Goodwill Impairment Testing [Line Items]
Goodwill	$ 28,155	$ 28,155