Pension Plans and Other Postretirement Benefits - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended							1 Months Ended		12 Months Ended					1 Months Ended	12 Months Ended					12 Months Ended							12 Months Ended					12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2005	Dec. 31, 2012 Pre-65 Coverage	Dec. 31, 2012 Post-65 Coverage	Jan. 01, 2007 Minimum	Jan. 01, 2007 Maximum	Dec. 31, 2012 Traditional Long Equity Holdings	Dec. 31, 2012 Diversified Asset Classes	Dec. 31, 2012 Domestic Pension Benefits	Dec. 31, 2011 Domestic Pension Benefits	Dec. 31, 2010 Domestic Pension Benefits	Jan. 31, 2013 Domestic Pension Benefits Subsequent Event	Dec. 31, 2012 Postretirement Benefits	Dec. 31, 2011 Postretirement Benefits	Dec. 31, 2010 Postretirement Benefits	Dec. 31, 2012 Postretirement Benefits Minimum	Dec. 31, 2012 Postretirement Benefits Maximum	Dec. 31, 2012 Foreign Pension Plans, Defined Benefit	Dec. 31, 2011 Foreign Pension Plans, Defined Benefit	Dec. 31, 2012 Pension Benefits	Dec. 31, 2011 Pension Benefits	Dec. 31, 2010 Pension Benefits	Dec. 31, 2012 Pension Benefits Minimum	Dec. 31, 2012 Pension Benefits Maximum	Dec. 31, 2012 Domestic Nonqualified and Foreign Qualified & Nonqualified	Dec. 31, 2011 Domestic Nonqualified and Foreign Qualified & Nonqualified	Dec. 31, 2010 Domestic Nonqualified and Foreign Qualified & Nonqualified	Dec. 31, 2012 Supplemental Executive Retirement Plan	Dec. 31, 2012 U.S. Postretirement Benefit Plan	Dec. 31, 2012 Supplemental Executive Retirement Plan	Dec. 31, 2011 Supplemental Executive Retirement Plan	Dec. 31, 2010 Supplemental Executive Retirement Plan	Dec. 31, 2012 U.S. Defined Contribution Plan Defined contribution 401 K employee savings plan	Dec. 31, 2011 U.S. Defined Contribution Plan Defined contribution 401 K employee savings plan	Dec. 31, 2010 U.S. Defined Contribution Plan Defined contribution 401 K employee savings plan	Dec. 31, 2012 U.K. Defined Contribution Plan	Dec. 31, 2011 U.K. Defined Contribution Plan	Dec. 31, 2010 U.K. Defined Contribution Plan	Dec. 31, 2012 Netherlands Defined Contribution Plan	Dec. 31, 2011 Netherlands Defined Contribution Plan	Dec. 31, 2010 Netherlands Defined Contribution Plan
Defined Benefit Plan Disclosure [Line Items]
Threshold for recognition in consolidated statements of income, percentage of fair value of plan assets or projected benefit obligations		10.00%
Smoothing period of asset gains and losses		5 years
Net curtailment gain		$ 4,507,000	[1]
Annual contribution percentage to defined contribution plan for eligible employees		5.00%
Increase in the percentage of pension contribution for employees									6.00%	7.00%
Pension contributions	10,100,000	14,800,000		4,500,000	3,900,000
Accumulated benefit obligation for defined benefit pension plans	738,700,000	738,700,000		657,000,000
Post retirement medical benefit available to U.S. employees, change of age group, current range						Under age 50
Age group for capping of retiree medical premium						Age 50 and above
Weighted-average expected rate of return on plan assets													8.25%	8.25%	8.25%	7.25%	7.00%	7.00%	7.00%			4.50%	4.50%	8.19%	8.19%	8.19%
Assumed weighted-average rate of compensation increase																											3.37%	3.96%
Assumed weighted-average rate of compensation increase, other postretirement plans																	3.50%	4.00%		3.50%	4.00%			3.37%	3.96%
Target allocations percentage of assets											65.00%	35.00%
Change in percentage of broad asset class targets		10.00%
Employer contribution		10,081,000	[1]														3,198,000	3,668,000						18,299,000	56,105,000				21,600,000	59,800,000	80,100,000	14,100,000					9,500,000	9,100,000	8,400,000	300,000	300,000	400,000
Expect contributions to benefit plans in 2013																													4,000,000					2,000,000
Expected premium contribution																																	5,000,000
Expenses related to benefit																																		10,300,000	4,700,000	3,800,000
Projected benefit obligation recognized																	70,787,000	68,935,000	66,436,000					762,395,000	674,665,000	613,880,000								30,900,000	31,900,000
Assumed trend rate							0.00%	0.00%
Percentage of increase/decrease with no material effect on benefit obligation and cost components		1.00%
Annual premiums and related costs pertaining to defined contribution plan																																											9,500,000	9,900,000	8,800,000
Accrued postemployment benefit liability	$ 600,000	$ 600,000		$ 600,000

[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."