GEOGRAPHIC INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Geographic Information
Revenues	$ 1,190,640	$ 1,706,310	$ 1,326,759	$ 1,037,247	$ 990,770	$ 1,452,804	$ 1,102,716	$ 809,320	$ 5,260,956	$ 4,355,610	$ 3,084,905
Intangible assets, net	208,113				200,151				208,113	200,151	232,030
Goodwill	522,672				504,784				522,672	504,784	510,894
Other long-lived assets	156,582				198,892				156,582	198,892	205,565
United States
Geographic Information
Revenues									1,661,710	1,761,065	1,640,673
Intangible assets, net	1,337				1,776				1,337	1,776	3,460
Goodwill	37,306				37,306				37,306	37,306	37,306
Other long-lived assets	76,623				148,150				76,623	148,150	180,623
The Netherlands
Geographic Information
Revenues									2,675,976	1,638,851	916,617
Intangible assets, net	137,255				78,850				137,255	78,850	91,295
Goodwill	149,464				142,576				149,464	142,576	147,214
Other long-lived assets	37,035				22,716				37,035	22,716	7,401
United Kingdom
Geographic Information
Revenues									491,376	709,393	419,709
Intangible assets, net	68,430				117,906				68,430	117,906	135,041
Goodwill	259,788				248,789				259,788	248,789	250,261
Other long-lived assets	26,375				15,939				26,375	15,939	9,584
Other.
Geographic Information
Revenues									431,894	246,301	107,906
Intangible assets, net	1,091				1,619				1,091	1,619	2,234
Goodwill	76,114				76,113				76,114	76,113	76,113
Other long-lived assets	$ 16,549				$ 12,087				$ 16,549	$ 12,087	$ 7,957