Pensions and Post Retirement Benefits Other than Pensions - Components of Net Periodic Benefit Cost (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 60,111	$ 63,269
Amortization of actuarial loss	(46,712)	(37,333)	(33,665)
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	4,161	3,103	3,160
Interest cost	12,532	13,846	14,115
Amortization of prior service cost	(688)	(688)	(542)
Amortization of actuarial loss	3,076	1,261
Net periodic benefit cost	19,081	17,522	16,733
Domestic Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	9,415	7,700	4,316
Interest cost	43,005	45,260	45,653
Expected return on plan assets	(43,269)	(50,206)	(50,457)
Amortization of prior service cost
Amortization of actuarial loss	36,818	30,300	27,741
Cooper Avon curtailment gain
Recognized actuarial loss (gain)			4,323
Net periodic benefit cost	45,969	33,054	31,576
United Kingdom plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	725	2,497	2,327
Interest cost	17,106	18,009	16,923
Expected return on plan assets	(15,323)	(16,646)	(15,249)
Amortization of prior service cost	(185)	(747)	(600)
Amortization of actuarial loss	6,818	5,772	5,924
Cooper Avon curtailment gain	(7,460)
Recognized actuarial loss (gain)			(673)
Net periodic benefit cost	$ 1,681	$ 8,885	$ 8,652