Summary Of Amount Paid (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Cash Flow Information [Line Items]
Interest paid	$ 77,686	$ 75,653	$ 76,911
Income taxes paid	$ 89,061	$ 188,510	$ 195,172