Components of Income Tax Expense Benefit (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Income before income taxes and equity in net income of unconsolidated investments:
Domestic	$ 316,856		$ 209,714		$ 221,086
Foreign	57,737		270,863		158,112
Income before income taxes and equity in net income of unconsolidated investments	374,593		480,577		379,198
Current income tax expense:
Federal	71,930	[1]	82,379	[1]	14,620	[1]
State	6,478		4,774		5,224
Foreign	18,712		28,179		25,776
Total	97,120		115,332		45,620
Deferred income tax expense (benefit):
Federal	(2,632)		(23,060)		52,246
State	477		(417)		(994)
Foreign	(12,432)		12,279		(9,116)
Total	(14,587)		(11,198)		42,136
Total income tax expense	$ 82,533		$ 104,134		$ 87,756

[1] Current income tax expense-Federal for the year ended December 31, 2010 is net of a tax benefit from an NOL carryforward of $9.6 million.