Reportable Segment Data (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information
Revenues	$ 215,702	$ 202,970	$ 427,897	$ 391,127
Cost of revenues	34,732	30,433	68,585	57,833
Gross profit	180,970	172,537	359,312	333,294
Licenses
Segment Reporting Information
Revenues	71,752	77,632	141,735	144,367
Cost of revenues	10,082	7,799	19,933	14,233
Gross profit	61,670	69,833	121,802	130,134
Maintenance Services
Segment Reporting Information
Revenues	129,393	110,276	256,212	218,342
Cost of revenues	12,208	10,469	24,027	20,480
Gross profit	117,185	99,807	232,185	197,862
Professional Services
Segment Reporting Information
Revenues	14,557	15,062	29,950	28,418
Cost of revenues	12,442	12,165	24,625	23,120
Gross profit	$ 2,115	$ 2,897	$ 5,325	$ 5,298