Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense	$ 44,152	$ 36,627	$ 39,254
Cost of revenue [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense	8,721	8,732	5,914
Cost of revenue [Member] | Software delivery, Support and Maintenance [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense	4,228	4,224	1,492
Cost of revenue [Member] | Client services [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense	4,493	4,508	4,422
Selling, General and Administrative Expenses [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense	27,256	20,069	25,376
Research and development [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense	$ 8,175	$ 7,826	$ 7,964