SEGMENT AND GEOGRAPHIC DATA Geographic Data Reporting (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
Segment Reporting Information [Line Items]
Revenue	$ 204,838	[1]	$ 247,378	[1]	$ 405,428	[1]	$ 465,917	[1]
Long-lived assets, net of accumulated depreciation and amortization	23,309	[2]	19,331	[2]	23,309	[2]	19,331	[2]
Net assets	106,989		102,908		106,989		102,908		107,357
United Kingdom
Segment Reporting Information [Line Items]
Revenue	53,644	[1]	67,683	[1]	105,652	[1]	131,483	[1]
Long-lived assets, net of accumulated depreciation and amortization	3,190	[2]	2,817	[2]	3,190	[2]	2,817	[2]
Net assets	24,826		29,942		24,826		29,942
Australia
Segment Reporting Information [Line Items]
Revenue	59,003	[1]	74,523	[1]	116,646	[1]	136,248	[1]
Long-lived assets, net of accumulated depreciation and amortization	9,747	[2]	6,142	[2]	9,747	[2]	6,142	[2]
Net assets	29,463		27,121		29,463		27,121
United States
Segment Reporting Information [Line Items]
Revenue	44,936	[1]	50,444	[1]	89,572	[1]	95,807	[1]
Long-lived assets, net of accumulated depreciation and amortization	4,571	[2]	4,685	[2]	4,571	[2]	4,685	[2]
Net assets	29,102		18,220		29,102		18,220
Continental Europe
Segment Reporting Information [Line Items]
Revenue	28,685	[1]	32,087	[1]	57,726	[1]	61,612	[1]
Long-lived assets, net of accumulated depreciation and amortization	1,567	[2]	1,808	[2]	1,567	[2]	1,808	[2]
Net assets	7,888		14,360		7,888		14,360
Other Asia Pacific
Segment Reporting Information [Line Items]
Revenue	18,019	[1]	22,173	[1]	34,748	[1]	39,849	[1]
Long-lived assets, net of accumulated depreciation and amortization	4,171	[2]	3,879	[2]	4,171	[2]	3,879	[2]
Net assets	15,156		12,908		15,156		12,908
Other Americas
Segment Reporting Information [Line Items]
Revenue	551	[1]	468	[1]	1,084	[1]	918	[1]
Long-lived assets, net of accumulated depreciation and amortization	63	[2]	0	[2]	63	[2]	0	[2]
Net assets	$ 554		$ 357		$ 554		$ 357

[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.