Other Noncurrent Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Disclosure Other Noncurrent Liabilities [Abstract]
Liabilities related to uncertain tax positions	$ 25,340	[1]	$ 29,834	[1]
Executive deferred compensation plan obligation	22,168		23,030
Deferred revenue—long-term	2,010		2,444
Environmental liabilities	4,841	[2]	9,213	[2]	17,213
Asset retirement obligations	15,085	[2]	16,930	[2]
Other	18,261		29,159
Total	$ 87,705		$ 110,610

[1] See Note 19, “Income Taxes.”

[2] See Note 16, “Commitments and Contingencies.”