Components of Net Periodic Benefit Cost Related to U.S Pension Benefits (Detail) (U.S. Retirement Benefit Plan, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
U.S. Retirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 828	$ 795	$ 2,528	$ 2,385
Interest cost	1,384	1,394	4,179	4,185
Expected return on plan assets	(1,654)	(1,464)	(4,959)	(4,455)
Amortization of prior service cost	880	683	2,745	2,048
Net periodic benefit cost	$ 1,438	$ 1,408	$ 4,493	$ 4,163