Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenue	$ 212,546	$ 235,182
Percentage of sale revenue net	100.00%	100.00%
Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	$ 63,264	$ 87,773
Revenue recognized over time
Disaggregation of Revenue [Line Items]
Total revenue	149,282	147,409
Perpetual license | Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	14,950	23,078
Term license | Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	48,314	64,695
Maintenance
Disaggregation of Revenue [Line Items]
Total revenue	67,706	64,525
Cloud | Revenue recognized over time
Disaggregation of Revenue [Line Items]
Total revenue	27,758	15,582
Consulting | Revenue recognized over time
Disaggregation of Revenue [Line Items]
Total revenue	53,818	67,302
Subscription
Disaggregation of Revenue [Line Items]
Total revenue	143,778	144,802
U.S.
Disaggregation of Revenue [Line Items]
Total revenue	103,991	113,985
Other Americas
Disaggregation of Revenue [Line Items]
Total revenue	28,829	17,715
United Kingdom (“U.K.”)
Disaggregation of Revenue [Line Items]
Total revenue	24,549	26,094
Europe (excluding U.K.), Middle East, and Africa
Disaggregation of Revenue [Line Items]
Total revenue	34,186	31,826
Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenue	$ 20,991	$ 45,562
Total Revenue | U.S.
Disaggregation of Revenue [Line Items]
Percentage of sale revenue net	48.00%	48.00%
Total Revenue | Other Americas
Disaggregation of Revenue [Line Items]
Percentage of sale revenue net	14.00%	8.00%
Total Revenue | United Kingdom (“U.K.”)
Disaggregation of Revenue [Line Items]
Percentage of sale revenue net	12.00%	11.00%
Total Revenue | Europe (excluding U.K.), Middle East, and Africa
Disaggregation of Revenue [Line Items]
Percentage of sale revenue net	16.00%	14.00%
Total Revenue | Asia-Pacific
Disaggregation of Revenue [Line Items]
Percentage of sale revenue net	10.00%	19.00%