Goodwill and Other Intangible Assets - Summary of the Gross Amount and Accumulated Impairment Losses of Goodwill (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Gross amount	$ 280,753	$ 280,753	$ 280,753
Accumulated impairment losses	(234,785)	(234,785)	(234,785)
Carrying value	45,968	45,968	45,968
Operating Segments | Technology
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
Operating Segments | Finance and Accounting
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
Operating Segments | Government Solutions
Goodwill [Line Items]
Gross amount	104,596	104,596	104,596
Accumulated impairment losses	(83,668)	(83,668)	(83,668)
Carrying value	$ 20,928	$ 20,928	$ 20,928