Pensions and Post Retirement Benefits Other than Pensions - Estimated Benefit Payments for Domestic and Foreign Pension Plans and Other Postretirement Benefit Plans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Pension Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
2013	$ 75,000
2014	72,000
2015	75,000
2016	75,000
2017	77,000
2018 through 2022	412,000
Other Postretirement Benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
2013	17,000
2014	17,000
2015	18,000
2016	18,000
2017	18,000
2018 through 2022	$ 94,000