Fair Value Measurements of Retirement Plan Assets within Fair Value Hierarchy (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$ 404,350	$ 416,272
Domestic Plans
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	268,742	290,197
Domestic Plans | Equity Securities | US core equity
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	73,986	79,550
Domestic Plans | Equity Securities | U.S. small/midcap
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	18,236	17,324
Domestic Plans | Equity Securities | US long/short equity fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	13,860	14,205
Domestic Plans | Equity Securities | International | Commingled trust fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	56,156	61,531
Domestic Plans | Equity Securities | Emerging market | Commingled equity fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	6,980	7,131
Domestic Plans | Fixed Income Securities | U.S. fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	76,764	81,989
Domestic Plans | Fixed Income Securities | International | Commingled trust fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	13,109	19,833
Domestic Plans | Fixed Income Securities | Emerging market | Mutual fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	6,448	7,045
Domestic Plans | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	3,203	1,589
Foreign Plans
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	135,608	126,075
Foreign Plans | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	1,827	3,184
Foreign Plans | Equity securities funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	59,349	58,353
Foreign Plans | Fixed income securities funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	44,442	31,948
Foreign Plans | Diversified pooled fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	29,990	32,590
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	97,252	101,647
Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic Plans
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	95,425	98,463
Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic Plans | Equity Securities | US core equity
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	73,986	79,550
Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic Plans | Equity Securities | U.S. small/midcap
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	18,236	17,324
Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic Plans | Equity Securities | US long/short equity fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic Plans | Equity Securities | International | Commingled trust fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic Plans | Equity Securities | Emerging market | Commingled equity fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic Plans | Fixed Income Securities | U.S. fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic Plans | Fixed Income Securities | International | Commingled trust fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic Plans | Fixed Income Securities | Emerging market | Mutual fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic Plans | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	3,203	1,589
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign Plans
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	1,827	3,184
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign Plans | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	1,827	3,184
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign Plans | Equity securities funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign Plans | Fixed income securities funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign Plans | Diversified pooled fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	307,098	314,625
Significant Other Observable Inputs (Level 2) | Domestic Plans
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	173,317	191,734
Significant Other Observable Inputs (Level 2) | Domestic Plans | Equity Securities | US core equity
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Other Observable Inputs (Level 2) | Domestic Plans | Equity Securities | U.S. small/midcap
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Other Observable Inputs (Level 2) | Domestic Plans | Equity Securities | US long/short equity fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	13,860	14,205
Significant Other Observable Inputs (Level 2) | Domestic Plans | Equity Securities | International | Commingled trust fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	56,156	61,531
Significant Other Observable Inputs (Level 2) | Domestic Plans | Equity Securities | Emerging market | Commingled equity fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	6,980	7,131
Significant Other Observable Inputs (Level 2) | Domestic Plans | Fixed Income Securities | U.S. fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	76,764	81,989
Significant Other Observable Inputs (Level 2) | Domestic Plans | Fixed Income Securities | International | Commingled trust fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	13,109	19,833
Significant Other Observable Inputs (Level 2) | Domestic Plans | Fixed Income Securities | Emerging market | Mutual fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	6,448	7,045
Significant Other Observable Inputs (Level 2) | Domestic Plans | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Other Observable Inputs (Level 2) | Foreign Plans
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	133,781	122,891
Significant Other Observable Inputs (Level 2) | Foreign Plans | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Other Observable Inputs (Level 2) | Foreign Plans | Equity securities funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	59,349	58,353
Significant Other Observable Inputs (Level 2) | Foreign Plans | Fixed income securities funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	44,442	31,948
Significant Other Observable Inputs (Level 2) | Foreign Plans | Diversified pooled fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	29,990	32,590
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Unobservable Inputs (Level 3) | Domestic Plans
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Unobservable Inputs (Level 3) | Domestic Plans | Equity Securities | US core equity
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Unobservable Inputs (Level 3) | Domestic Plans | Equity Securities | U.S. small/midcap
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Unobservable Inputs (Level 3) | Domestic Plans | Equity Securities | US long/short equity fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Unobservable Inputs (Level 3) | Domestic Plans | Equity Securities | International | Commingled trust fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Unobservable Inputs (Level 3) | Domestic Plans | Equity Securities | Emerging market | Commingled equity fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Unobservable Inputs (Level 3) | Domestic Plans | Fixed Income Securities | U.S. fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Unobservable Inputs (Level 3) | Domestic Plans | Fixed Income Securities | International | Commingled trust fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Unobservable Inputs (Level 3) | Domestic Plans | Fixed Income Securities | Emerging market | Mutual fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Unobservable Inputs (Level 3) | Domestic Plans | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Unobservable Inputs (Level 3) | Foreign Plans
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Unobservable Inputs (Level 3) | Foreign Plans | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Unobservable Inputs (Level 3) | Foreign Plans | Equity securities funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Unobservable Inputs (Level 3) | Foreign Plans | Fixed income securities funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Significant Unobservable Inputs (Level 3) | Foreign Plans | Diversified pooled fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$ 0	$ 0