Segment Information - Geographical Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 77,584	$ 79,856	$ 153,071	$ 153,483
Property and equipment, net	15,998		15,998		15,366	[1]
Goodwill	29,748		29,748		29,748	[1]
Total Intangible Assets, Net	77,603		77,603		85,043	[1]
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	26,391	23,903	55,952	42,949
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	25,530	23,651	54,291	42,357
Property and equipment, net	8,808		8,808		8,748
Goodwill	29,588		29,588		29,588
Total Intangible Assets, Net	75,878		75,878		82,975
Other North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	861	252	1,661	592
Property and equipment, net	521		521		568
Total Intangible Assets, Net	299		299		386
Europe, the Middle East and Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	12,371	16,340	31,819	41,796
Property and equipment, net	2,899		2,899		2,928
Goodwill	160		160		160
Total Intangible Assets, Net	1,426		1,426		1,682
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	38,822	39,613	65,300	68,738
Property and equipment, net	$ 3,770		$ 3,770		$ 3,122

[1] (A)As adjusted to reflect the impact of additional tax-related adjustments to the Company's purchase accounting for Continuous Computing in accordance with ASC 805-10 "Business Combinations". See Note 2 — Acquisitions for additional information.