Reconciliation of Benefit Obligations, Plan Assets and Funded Status of Plans, as well as Summary of Significant Assumptions for Benefit Plans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Reconciliation of Changes in Asset Retirement Obligations [Line Items]
Plan amendments	$ (4,500)
Employer contributions	10,081	[1]
Pension Benefits
Reconciliation of Changes in Asset Retirement Obligations [Line Items]
Benefit obligation, beginning balance	674,665		613,880
Service cost	12,741		12,830		11,271
Interest cost	31,636		32,933		31,844
Plan amendments	1,123		508
Actuarial loss	90,336		49,729
Benefits paid	(49,234)		(35,249)
Employee contributions	294		299
Foreign exchange loss (gain)	834		(265)
Benefit obligation, ending balance	762,395		674,665		613,880
Fair value of plan assets, beginning balance	531,105	[2]	507,064
Actual return on plan assets	62,577		3,107
Employer contributions	18,299		56,105
Benefits paid	(49,234)		(35,249)
Employee contributions	294		299
Foreign exchange gain (loss)	262		(221)
Fair value of plan assets, Ending Balance	563,303	[2]	531,105	[2]	507,064
Funded status	(199,092)		(143,560)
Current liabilities (accrued expenses)	(3,611)		(15,596)
Noncurrent liabilities	(195,481)		(127,964)
Net liability	(199,092)		(143,560)
Prior service benefit	(759)		(7,193)
Net amount recognized	(759)		(7,193)
Weighted-average assumption percentages:
Discount rate	4.04%		5.04%
Rate of compensation increase	3.37%		3.96%
Domestic Pension Plans of Foreign Entity, Defined Benefit
Reconciliation of Changes in Asset Retirement Obligations [Line Items]
Benefit obligation, beginning balance	634,184		572,963
Service cost	11,274		11,169
Interest cost	29,843		30,945
Plan amendments	1,123		508
Actuarial loss	83,428		48,977
Benefits paid	(45,694)		(30,378)
Benefit obligation, ending balance	714,158		634,184
Fair value of plan assets, beginning balance	522,408		498,967
Actual return on plan assets	62,167		2,662
Employer contributions	15,298		51,157
Benefits paid	(45,694)		(30,378)
Fair value of plan assets, Ending Balance	554,179		522,408
Funded status	(159,979)		(111,776)
Current liabilities (accrued expenses)	(2,015)		(13,927)
Noncurrent liabilities	(157,964)		(97,849)
Net liability	(159,979)		(111,776)
Prior service benefit	(1,181)		(7,616)
Net amount recognized	(1,181)		(7,616)
Weighted-average assumption percentages:
Discount rate	4.10%		5.07%
Rate of compensation increase	3.50%		4.11%
Postretirement Benefits
Reconciliation of Changes in Asset Retirement Obligations [Line Items]
Benefit obligation, beginning balance	68,935		66,436
Service cost	274		263		382
Interest cost	3,172		3,393		3,564
Actuarial loss	3,032		3,555
Benefits paid	(4,626)		(4,712)
Benefit obligation, ending balance	70,787		68,935		66,436
Fair value of plan assets, beginning balance	7,681	[2]	7,985
Actual return on plan assets	358		740
Employer contributions	3,198		3,668
Benefits paid	(4,626)		(4,712)
Fair value of plan assets, Ending Balance	6,611	[2]	7,681	[2]	7,985
Funded status	(64,176)		(61,254)
Current liabilities (accrued expenses)	(3,361)		(3,666)
Noncurrent liabilities	(60,815)		(57,588)
Net liability	(64,176)		(61,254)
Prior service benefit	(525)		(620)
Net amount recognized	$ (525)		$ (620)
Weighted-average assumption percentages:
Discount rate	4.00%		5.10%
Rate of compensation increase	3.50%		4.00%

[1] In the fourth quarter of 2012 we recorded a net curtailment gain of $4.5 million ($2.9 million after income taxes) and a one-time employer contribution to the Company's defined contribution plan of $10.1 million ($6.4 million after income taxes), both in connection with various amendments to certain of our U.S. pension and defined contribution plans that were approved by our Board of Directors in the fourth quarter of 2012. See Note 17, "Pension Plans and Other Postretirement Benefits."

[2] See Note 17 "Pension Plans and Other Postretirement Benefits" for further discussion on fair value measurements of our pension and postretirement assets.