Employee Benefits - Amounts Recognized in Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Other assets	$ 1,338	$ 14,058
Retirement liabilities	(354,333)	(238,225)
U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	0	0
Other current liabilities	(3,887)	(3,819)
Retirement liabilities	(119,791)	(91,930)
Net amount recognized	(123,678)	(95,749)
Non-U.S. Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	1,338	14,058
Other current liabilities	(608)	(651)
Retirement liabilities	(113,103)	(32,315)
Net amount recognized	$ (112,373)	$ (18,908)