Other Noncurrent Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Schedule Of Other Liabilities Noncurrent [Line Items]
Liabilities related to uncertain tax positions	$ 29,179	[1]	$ 30,677	[1]
Executive deferred compensation plan obligation	20,265		16,786
Deferred revenue-long-term	3,362		11,412
Environmental liabilities	17,213	[2]	10,926	[2]	12,145
Asset retirement obligations	16,517	[2]	14,865	[2]
Other	27,486		26,441
Total	$ 114,022		$ 111,107

[1] See Note 18, "Income Taxes."

[2] See Note 15, "Commitments and Contingencies."