Disaggregation of Revenue (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Total revenue	$ 196,779	$ 186,596	$ 431,961	$ 442,905
Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	44,784	51,150	132,557	178,158
Revenue recognized over time
Disaggregation of Revenue [Line Items]
Total revenue	151,995	135,446	299,404	264,747
Perpetual License
Disaggregation of Revenue [Line Items]
Total revenue	13,475	31,297	36,553	69,196
Term License
Disaggregation of Revenue [Line Items]
Total revenue	31,309	19,853	96,004	108,962
Maintenance
Disaggregation of Revenue [Line Items]
Total revenue	65,906	59,424	130,431	118,137
Cloud
Disaggregation of Revenue [Line Items]
Total revenue	20,201	12,525	35,783	22,927
Consulting and Training
Disaggregation of Revenue [Line Items]
Total revenue	65,888	63,497	133,190	123,683
United States
Disaggregation of Revenue [Line Items]
Total revenue	110,349	102,098	224,334	271,760
Other Americas
Disaggregation of Revenue [Line Items]
Total revenue	9,627	13,177	27,342	23,583
United Kingdom (U.K.)
Disaggregation of Revenue [Line Items]
Total revenue	23,079	22,524	49,173	48,866
Europe (excluding U.K.), Middle East, and Africa
Disaggregation of Revenue [Line Items]
Total revenue	27,070	26,237	58,896	50,448
Asia Pacific
Disaggregation of Revenue [Line Items]
Total revenue	$ 26,654	$ 22,560	$ 72,216	$ 48,248
Total Revenue
Disaggregation of Revenue [Line Items]
Percentage of sale revenue net	100.00%	100.00%	100.00%	100.00%
Total Revenue | United States
Disaggregation of Revenue [Line Items]
Percentage of sale revenue net	55.00%	55.00%	52.00%	62.00%
Total Revenue | Other Americas
Disaggregation of Revenue [Line Items]
Percentage of sale revenue net	5.00%	7.00%	6.00%	5.00%
Total Revenue | United Kingdom (U.K.)
Disaggregation of Revenue [Line Items]
Percentage of sale revenue net	12.00%	12.00%	11.00%	11.00%
Total Revenue | Europe (excluding U.K.), Middle East, and Africa
Disaggregation of Revenue [Line Items]
Percentage of sale revenue net	14.00%	14.00%	14.00%	11.00%
Total Revenue | Asia Pacific
Disaggregation of Revenue [Line Items]
Percentage of sale revenue net	14.00%	12.00%	17.00%	11.00%