Revenues, Expenses and Operating Income by Reporting Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Software license	$ 19,758	$ 17,989	$ 39,072	$ 35,096
Services	107,344	93,519	208,547	180,432
Hardware and other	12,007	11,022	25,013	20,565
Total revenue	139,109	122,530	272,632	236,093
Cost of revenue	58,764	52,570	117,001	100,122
Operating expenses	37,073	35,971	73,714	70,443
Depreciation and amortization	1,898	1,489	3,679	2,977
Total costs and expenses	97,735	90,030	194,394	173,542
Operating income	41,374	32,500	78,238	62,551
Americas
Segment Reporting Information [Line Items]
Software license	17,294	14,498	32,777	25,956
Services	88,563	73,884	170,775	144,788
Hardware and other	11,297	10,251	23,561	19,244
Total revenue	117,154	98,633	227,113	189,988
Cost of revenue	47,251	41,385	93,652	78,034
Operating expenses	32,013	30,766	63,794	59,986
Depreciation and amortization	1,676	1,355	3,271	2,708
Total costs and expenses	80,940	73,506	160,717	140,728
Operating income	36,214	25,127	66,396	49,260
EMEA
Segment Reporting Information [Line Items]
Software license	2,115	1,621	5,648	6,071
Services	14,504	13,851	28,704	24,715
Hardware and other	556	439	1,128	804
Total revenue	17,175	15,911	35,480	31,590
Cost of revenue	8,639	7,551	17,546	15,027
Operating expenses	3,908	4,049	7,671	8,119
Depreciation and amortization	112	72	225	147
Total costs and expenses	12,659	11,672	25,442	23,293
Operating income	4,516	4,239	10,038	8,297
APAC
Segment Reporting Information [Line Items]
Software license	349	1,870	647	3,069
Services	4,277	5,784	9,068	10,929
Hardware and other	154	332	324	517
Total revenue	4,780	7,986	10,039	14,515
Cost of revenue	2,874	3,634	5,803	7,061
Operating expenses	1,152	1,156	2,249	2,338
Depreciation and amortization	110	62	183	122
Total costs and expenses	4,136	4,852	8,235	9,521
Operating income	$ 644	$ 3,134	$ 1,804	$ 4,994