SEGMENT AND GEOGRAPHIC DATA Geographic Data Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenue	$ 165,678	[1]	$ 200,590	[1]
Long-lived assets, net of accumulated depreciation and amortization	20,993	[2]	20,175	[2]
Net assets	96,868		107,124		106,541
United Kingdom
Segment Reporting Information [Line Items]
Revenue	47,078	[1]	52,007	[1]
Long-lived assets, net of accumulated depreciation and amortization	3,548	[2]	3,183	[2]
Net assets	25,426		30,112
Australia
Segment Reporting Information [Line Items]
Revenue	42,042	[1]	57,644	[1]
Long-lived assets, net of accumulated depreciation and amortization	8,595	[2]	6,030	[2]
Net assets	29,687		29,730
United States
Segment Reporting Information [Line Items]
Revenue	36,952	[1]	44,636	[1]
Long-lived assets, net of accumulated depreciation and amortization	3,866	[2]	4,833	[2]
Net assets	21,501		21,558
Continental Europe
Segment Reporting Information [Line Items]
Revenue	25,175	[1]	29,041	[1]
Long-lived assets, net of accumulated depreciation and amortization	1,147	[2]	1,707	[2]
Net assets	6,069		10,634
Other Asia Pacific
Segment Reporting Information [Line Items]
Revenue	14,160	[1]	16,728	[1]
Long-lived assets, net of accumulated depreciation and amortization	3,785	[2]	4,364	[2]
Net assets	13,938		14,554
Other Americas
Segment Reporting Information [Line Items]
Revenue	271	[1]	534	[1]
Long-lived assets, net of accumulated depreciation and amortization	52	[2]	58	[2]
Net assets	$ 247		$ 536

[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.