Employee Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Other long-term asset	$ 41,919	$ 4,021
Pension and other post-retirement liabilities	(140,171)	(572,988)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Other long-term asset	41,919	4,021
Other current liability	(5,976)	(5,402)
Pension and other post-retirement liabilities	(138,065)	(568,632)
Amounts recognized in consolidated balance sheets	$ (102,122)	$ (570,013)