Benefit Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Pension plan contribution	$ 235,200,000	$ 37,100,000
Defined accumulated benefit obligation plans	804,200,000	625,900,000
Expected rate of return on plan assets	7.50%	8.00%	8.50%
Pension plan assets yielded returns	10.80%	7.80%	11.20%
Expected rate of return on plan assets assumption	3.75%
Allocation of Pension Plans	90.00%
Annual eligible compensation percentage	1.50%
Matching contribution to eligible employee contributions	500.00%
Additional Matching contribution to eligible employee contributions	4.00%
Participants are 100% vested in employer match	After 3 years of service
401(k) plan and ESOP combined expenese	19,700,000	15,800,000	11,000,000
Other accrued retirement compensation	52,600,000	12,600,000
Maximum
Defined Benefit Plan Disclosure [Line Items]
Expected contribution	35,000,000
Minimum
Defined Benefit Plan Disclosure [Line Items]
Expected contribution	30,000,000
Years of Service	30 years
Defined Contribution Pension Plan 401k
Defined Benefit Plan Disclosure [Line Items]
401(k) plan description	Under the 401(k) 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.
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%
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	331,000,000
U.S. Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	358,854,000	28,178,000
Pension plan contribution	190,000,000
Discount rate	3.67%	5.05%	5.90%
Non-US Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Benefits paid	$ 6,175,000	$ 2,310,000
Non-US Pension Plans | Maximum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	0.50%	0.75%	0.75%
Non-US Pension Plans | Minimum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.50%	5.00%	5.40%
An Additional 1% Match
Defined Benefit Plan Disclosure [Line Items]
Additional Matching contribution to eligible employee contributions	1.00%
An Additional 1% Match | Maximum
Defined Benefit Plan Disclosure [Line Items]
Years of Service	19 years
An Additional 1% Match | Minimum
Defined Benefit Plan Disclosure [Line Items]
Years of Service	10 years
An Additional 2% Match
Defined Benefit Plan Disclosure [Line Items]
Additional Matching contribution to eligible employee contributions	2.00%
An Additional 2% Match | Maximum
Defined Benefit Plan Disclosure [Line Items]
Years of Service	24 years
An Additional 2% Match | Minimum
Defined Benefit Plan Disclosure [Line Items]
Years of Service	20 years
An Additional 3% Match
Defined Benefit Plan Disclosure [Line Items]
Additional Matching contribution to eligible employee contributions	3.00%
An Additional 3% Match | Maximum
Defined Benefit Plan Disclosure [Line Items]
Years of Service	29 years
An Additional 3% Match | Minimum
Defined Benefit Plan Disclosure [Line Items]
Years of Service	25 years