SEGMENT AND GEOGRAPHIC DATA Geographic Data Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011		Dec. 31, 2011
Segment Reporting Information [Line Items]
Revenue	$ 187,873	[1]	$ 245,081	[1]	$ 593,301	[1]	$ 710,998	[1]
Long-lived assets, net of accumulated depreciation and amortization	22,850	[2]	19,329	[2]	22,850	[2]	19,329	[2]
Net assets	106,709		101,990		106,709		101,990		107,357
United Kingdom
Segment Reporting Information [Line Items]
Revenue	52,097	[1]	67,890	[1]	157,749	[1]	199,373	[1]
Long-lived assets, net of accumulated depreciation and amortization	3,413	[2]	3,181	[2]	3,413	[2]	3,181	[2]
Net assets	23,931		31,099		23,931		31,099
Australia
Segment Reporting Information [Line Items]
Revenue	55,449	[1]	76,882	[1]	172,096	[1]	213,130	[1]
Long-lived assets, net of accumulated depreciation and amortization	9,550	[2]	5,406	[2]	9,550	[2]	5,406	[2]
Net assets	30,073		27,357		30,073		27,357
United States
Segment Reporting Information [Line Items]
Revenue	38,461	[1]	46,952	[1]	128,033	[1]	142,759	[1]
Long-lived assets, net of accumulated depreciation and amortization	4,217	[2]	5,122	[2]	4,217	[2]	5,122	[2]
Net assets	27,030		16,255		27,030		16,255
Continental Europe
Segment Reporting Information [Line Items]
Revenue	23,237	[1]	28,368	[1]	80,963	[1]	89,981	[1]
Long-lived assets, net of accumulated depreciation and amortization	1,528	[2]	1,724	[2]	1,528	[2]	1,724	[2]
Net assets	8,075		12,490		8,075		12,490
Other Asia Pacific
Segment Reporting Information [Line Items]
Revenue	17,988	[1]	24,250	[1]	52,735	[1]	64,099	[1]
Long-lived assets, net of accumulated depreciation and amortization	4,081	[2]	3,896	[2]	4,081	[2]	3,896	[2]
Net assets	17,088		14,376		17,088		14,376
Other Americas
Segment Reporting Information [Line Items]
Revenue	641	[1]	739	[1]	1,725	[1]	1,656	[1]
Long-lived assets, net of accumulated depreciation and amortization	61	[2]	0	[2]	61	[2]	0	[2]
Net assets	$ 512		$ 413		$ 512		$ 413

[1] Revenue by geographic region disclosed above is net of any inter-segment revenue and, therefore, represents only revenue from external customers according to the location of the operating subsidiary.

[2] Comprised of property and equipment and intangibles. Corporate assets are included in the United States.