Components of Net Periodic Benefit Cost Related to U.S Pension Benefits (Detail) (U.S. pension benefits, USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
U.S. pension benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 647	$ 762	$ 1,400	$ 1,700
Interest cost	1,575	1,385	3,085	2,795
Expected return on plan assets	(1,920)	(1,650)	(3,835)	(3,305)
Amortization of prior service cost	490	858	920	1,865
Net periodic benefit cost	$ 792	$ 1,355	$ 1,570	$ 3,055