Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended										12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues:
License		$ 159,277	$ 43,256	$ 33,510		$ 37,423		$ 94,230	$ 50,237	$ 67,161	$ 39,577	$ 273,466	$ 251,205	$ 235,157
Maintenance		58,072	57,741	60,332		57,331		63,000	59,262	60,141	59,492	233,476	241,895	255,993
Services		24,262	19,809	23,823		19,576		34,371	25,842	23,110	23,497	87,470	106,820	105,584
Hosting		101,119	96,169	102,265		111,736		117,036	103,360	115,410	110,251	411,289	446,057	419,415
Total revenues		342,730	216,975	219,930		226,066		308,637	238,701	265,822	232,817	1,005,701	1,045,977	1,016,149
Operating expenses:
Cost of license	[1]	7,043	5,253	4,610		5,439		5,810	5,387	5,939	6,109	22,345	23,245	24,565
Cost of maintenance, services and hosting	[1]	103,786	95,014	110,774	[2]	112,995	[2]	111,285	104,272	120,484	113,013	422,569	449,054	430,191
Research and development		37,665	42,210	46,421	[2]	43,604	[2]	33,285	36,123	39,425	37,091	169,900	145,924	144,207
Selling and marketing		29,421	29,874	28,795	[2]	29,992	[2]	40,747	28,451	31,298	28,911	118,082	129,407	112,047
General and administrative		21,639	31,390	34,520	[2]	26,068	[2]	20,552	20,284	25,008	21,575	113,617	87,419	95,065
Gain on sale of CFS assets			489			(151,952)						(151,463)
Depreciation and amortization		22,833	22,098	21,382		23,208		22,985	20,298	20,004	19,693	89,521	82,980	71,902
Total operating expenses		222,387	226,328	246,502	[2]	89,354	[2]	234,664	214,815	242,158	226,392	784,571	918,029	877,977
Operating income		120,343	(9,353)	(26,572)	[2]	136,712	[2]	73,973	23,886	23,664	6,425	221,130	127,948	138,172
Other income (expense):
Interest expense		(10,217)	(9,838)	(9,715)		(10,414)		(10,198)	(9,728)	(10,505)	(10,941)	(40,184)	(41,372)	(39,738)
Interest income		114	145	121		150		132	94	58	102	530	386	575
Other, net		(378)	2,794	2,023		(334)		(1,284)	4,314	19,659	3,722	4,105	26,411	(240)
Total other income (expense)		(10,481)	(6,899)	(7,571)		(10,598)		(11,350)	(5,320)	9,212	(7,117)	(35,549)	(14,575)	(39,403)
Income (loss) before income taxes		109,862	(16,252)	(34,143)	[2]	126,114	[2]	62,623	18,566	32,876	(692)	185,581	113,373	98,769
Income tax expense (benefit)		43,171	(6,426)	(17,669)	[2]	36,970	[2]	18,856	3,786	5,825	(530)	56,046	27,937	31,209
Net income (loss)		$ 66,691	$ (9,826)	$ (16,474)	[2]	$ 89,144	[2]	$ 43,767	$ 14,780	$ 27,051	$ (162)	$ 129,535	$ 85,436	$ 67,560
Earnings (loss) per share
Basic		$ 0.57	$ (0.08)	$ (0.14)		$ 0.75		$ 0.37	$ 0.13	$ 0.23	$ 0.00	$ 1.10	$ 0.73	$ 0.59
Diluted		$ 0.56	$ (0.08)	$ (0.14)		$ 0.74		$ 0.36	$ 0.12	$ 0.23	$ 0.00	$ 1.09	$ 0.72	$ 0.58

[1] The cost of software license fees excludes charges for depreciation but includes amortization of purchased and developed software for resale. The cost of maintenance, services and hosting fees excludes charges for depreciation.

[2] As previously discussed in Note 1, Nature of Business and Summary of Significant Accounting Policies, the Company adopted ASU 2016-09 during the year ended December 31, 2016. The Company elected to early adopt ASU 2016-09 in the third quarter of 2016, which requires it to reflect any adjustments as of January 1, 2016, the beginning of the annual period that includes the interim period of adoption. The impact of the adoption to the Company's previously reported quarterly results for the quarters ended March 31 and June 30, 2016 are reflected in the table above.