Goodwill and Other Intangible Assets - Summary of the Gross Amount and Accumulated Impairment Losses of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Carrying value	$ 45,968	$ 48,900	$ 63,410
Technology [Member]
Goodwill [Line Items]
Gross amount	156,391	156,391	156,391
Accumulated impairment losses	(139,357)	(139,357)	(139,357)
Carrying value	17,034	17,034	17,034
Finance and Accounting [Member]
Goodwill [Line Items]
Gross amount	19,766	19,766	19,766
Accumulated impairment losses	(11,760)	(11,760)	(11,760)
Carrying value	8,006	8,006	8,006
Government Solutions [Member]
Goodwill [Line Items]
Gross amount	104,596	102,641	102,641
Accumulated impairment losses	(83,668)	(83,668)	(69,158)
Carrying value	$ 20,928	$ 18,973	$ 33,483