Retirement Benefits - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011 Investment	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation, pension benefit plans	$ 565,300,000	$ 510,500,000
Accumulated benefit obligations in excess of plan assets, projected benefit obligation	520,700,000	208,500,000
Accumulated benefit obligations in excess of plan assets, accumulated benefit obligation	495,500,000	204,000,000
Accumulated benefit obligations in excess of plan assets, fair value of plan assets	429,900,000	165,900,000
Multiemployer pension plan contributions	6,027,000	6,125,000	6,029,000
Defined contribution plans contributions charged to expense	8,000,000	8,300,000	7,300,000
Equity securities, target allocation	58.00%
Debt securities, target allocation	42.00%
Concentration of risk description	As of December 31, 2011, approximately 99 percent of plan assets were under management by a single investment management company in six individual commingled equity and debt index funds. Of these six funds, four funds held assets individually in excess of ten percent of our total plan assets.
Plan assets held under management by single investment company	99.00%
Number of comingled debt and equity index funds,	6
Number of asset funds	4
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation discount rate	4.90%	5.50%
Benefit obligation rate of compensation increase	3.50%	3.50%
Projected benefit obligation	$ 42,000,000	$ 38,100,000
Net periodic benefit cost discount rate	5.50%	5.90%	5.90%
Net periodic benefit cost rate of compensation increase	3.50%	3.50%	3.50%
United States
Defined Benefit Plan Disclosure [Line Items]
Equity securities, target allocation	49.00%
Equity securities, target allocation as percentage of total equity securities	85.00%