Benefit Pension and Other Postretirement Benefit Cost (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Components of net periodic benefit cost:
Amortization of prior service cost	$ 172	$ 359	$ 700	$ 1,080
Amortization of actuarial loss	(11,617)	(9,339)	(35,020)	(28,029)
Pension Benefit - Domestic
Components of net periodic benefit cost:
Service cost	2,354	1,925	7,061	5,775
Interest cost	10,714	11,250	32,142	33,750
Expected return on plan assets	(10,754)	(12,526)	(32,264)	(37,579)
Amortization of actuarial loss	9,205	7,575	27,614	22,725
Net periodic benefit cost	11,519	8,224	34,553	24,671
U.K Plan [Member]
Components of net periodic benefit cost:
Service cost	1	627	753	1,885
Interest cost	4,280	4,523	12,722	13,600
Expected return on plan assets	(3,892)	(4,180)	(11,371)	(12,570)
Amortization of prior service cost		(187)	(184)	(564)
Amortization of actuarial loss	1,643	1,449	5,099	4,358
Cooper Avon curtailment gain			(7,460)
Net periodic benefit cost	2,032	2,232	(441)	6,709
Other Postretirement Benefits
Components of net periodic benefit cost:
Service cost	1,040	775	3,121	2,327
Interest cost	3,133	3,462	9,399	10,385
Amortization of prior service cost	(172)	(172)	(516)	(516)
Amortization of actuarial loss	769	315	2,307	946
Net periodic benefit cost	$ 4,770	$ 4,380	$ 14,311	$ 13,142