Fair Value Measurements of Retirement Plan Assets within Fair Value of Hierarchy (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$ 463,546	$ 404,350
Domestic Plans
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	299,435	268,742
Domestic Plans | Equity securities | US core equity
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	83,392	73,986
Domestic Plans | Equity securities | U.S. small/midcap
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	20,894	18,236
Domestic Plans | Equity securities | US long/short equity fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	14,654	13,860
Domestic Plans | Equity securities | International | Commingled trust fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	62,111	56,156
Domestic Plans | Equity securities | Emerging market | Commingled equity fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	9,535	6,980
Domestic Plans | Fixed income securities | U.S. fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	80,203	76,764
Domestic Plans | Fixed income securities | International | Commingled trust fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	15,179	13,109
Domestic Plans | Fixed income securities | Emerging market | Mutual fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	10,060	6,448
Domestic Plans | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	3,407	3,203
Foreign Plans
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	164,111	135,608
Foreign Plans | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	1,343	1,827
Foreign Plans | Equity securities funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	79,233	59,349
Foreign Plans | Fixed income securities funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	51,777	44,442
Foreign Plans | Diversified pooled fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	31,758	29,990
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	109,036	97,252
Quoted Prices in Active Markets for Identical Assets (Level 1) | Domestic Plans
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	107,693	95,425
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	83,392	73,986
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	20,894	18,236
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	3,407	3,203
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign Plans
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	1,343	1,827
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	1,343	1,827
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	354,510	307,098
Significant Other Observable Inputs (Level 2) | Domestic Plans
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	191,742	173,317
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	14,654	13,860
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	62,111	56,156
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	9,535	6,980
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	80,203	76,764
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	15,179	13,109
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	10,060	6,448
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	162,768	133,781
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	79,233	59,349
Significant Other Observable Inputs (Level 2) | Foreign Plans | Fixed income securities funds
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	51,777	44,442
Significant Other Observable Inputs (Level 2) | Foreign Plans | Diversified pooled fund
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	31,758	29,990
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