Benefit Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Defined Fund Plan	$ 241,800,000
Defined accumulated benefit obligation plans	625,900,000	557,700,000
Expected rate of return on plan assets	8.00%	8.50%	8.50%
Pension plan assets yielded returns	7.80%	11.20%	19.50%
Expected rate of return on plan assets assumption	7.50%
Cumulative unrecognized losses	186,100,000
Minimum percentage of unrecognized gains or losses	10.00%
Description of plan asset and benefit obligation	To the extent the unrecognized losses, when adjusted for the difference between market and market related values of assets, exceeds 10% of the projected benefit obligation, it will be amortized into expense each year on a straight-line basis over the remaining expected future-working lifetime of active participants (currently approximating 12 years).
Defined benefit plan amortization description	It will be amortized into expense each year on a straight-line basis over the remaining expected future-working lifetime of active participants (currently approximating 12 years).
Pension plan contribution	37,100,000	49,800,000
Annual eligible compensation percentage	1.50%
Expense for the plan and ESOP	15,800,000	11,000,000	6,700,000
Other accrued retirement compensation	12,600,000	13,900,000
Minimum
Defined Benefit Plan Disclosure [Line Items]
Expected contribution	40,000,000
Maximum
Defined Benefit Plan Disclosure [Line Items]
Expected contribution	45,000,000
United States Pension Plans of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.05%	5.90%	6.00%
Fixed income investment percentage minimum	40.00%	30.00%
Fixed income investment percentage maximum	50.00%	40.00%
Defined Contribution Pension Plan 401k
Defined Benefit Plan Disclosure [Line Items]
401(k) plan description	Under the plan, eligible U.S. employees may voluntarily contribute a percentage of their eligible compensation. We match contributions made by employees who meet certain eligibility and service requirements. Our matching contribution is 100% of eligible employee contributions for the first 1% of eligible compensation and 50% of the next 5% of eligible compensation. In June 2009, we temporarily suspended the company match of the plan and ESOP. We reinstated the company match in 2010.
Defined Contribution Pension Plan 401k | The first 1% of eligible compensation
Defined Benefit Plan Disclosure [Line Items]
Matching contribution to eligible employee contributions	100.00%
Defined Contribution Pension Plan 401k | The next 5% of eligible compensation
Defined Benefit Plan Disclosure [Line Items]
Matching contribution to eligible employee contributions	50.00%
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined Fund Plan	$ 137,900,000
Foreign Pension Plans, Defined Benefit | Minimum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	0.75%	0.75%	2.00%
Foreign Pension Plans, Defined Benefit | Maximum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.00%	5.40%	6.00%