Supplemental Financial Information - Noncash Investing and Financing Activities (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Condensed Financial Statements, Captions [Line Items]
Accrued but unpaid capital expenditures at period end	$ 74,308	$ 48,620
Cash interest payments	54,000	54,187
U.S Federal [Member]
Cash income taxes paid, net of refunds:
Cash income taxes paid, net of refunds	47,000	53,000
Foreign [Member]
Cash income taxes paid, net of refunds:
Cash income taxes paid, net of refunds	62,951	56,070
State [Member]
Cash income taxes paid, net of refunds:
Cash income taxes paid, net of refunds	$ 190	$ 212