QUARTERLY RESULTS (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Quarterly Financial Information [Line Items]
Revenues	$ 1,501,914	$ 1,606,368	$ 1,581,368	$ 1,460,848	$ 1,582,135	$ 1,667,559	$ 1,516,770	$ 1,201,109	$ 6,150,498	$ 5,967,573	$ 4,092,283
Net revenues	476,155	493,846	472,561	453,915	453,362	458,743	418,858	361,823	1,896,477	1,692,786	1,382,786
Net earnings	93,140	106,876	95,020	91,207	96,448	96,038	90,409	61,310	386,243	344,205	240,397
Net earnings attributable to shareholders	$ 92,843	$ 106,604	$ 95,000	$ 91,232	$ 96,502	$ 96,105	$ 90,318	$ 61,247	$ 385,679	$ 344,172	$ 240,217
Diluted earnings attributable to shareholders per share	$ 0.43	$ 0.50	$ 0.44	$ 0.42	$ 0.45	$ 0.44	$ 0.42	$ 0.28	$ 1.79	$ 1.59	$ 1.11
Basic earnings attributable to shareholders per share	$ 0.44	$ 0.50	$ 0.45	$ 0.43	$ 0.45	$ 0.45	$ 0.43	$ 0.29	$ 1.82	$ 1.62	$ 1.13