Employee Benefit Plans (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefits Pension Benefits
Noncurrent liabilities	$ (343,842,000)	$ (223,777,000)
Multiemployer plans
Contributions to multi-employer pension plans	26,913,000	22,989,000	22,512,000
Weighted-average actuarial assumptions used to determine net periodic pension cost
Discount rates (as a percent)	5.40%	5.80%	6.10%
Rates of compensation increase (as a percent)	3.30%	3.60%	3.40%
Weighted-average actuarial assumptions used to determine defined benefit pension plan obligations
Discount rates (as a percent)	4.70%	5.40%
Rates of compensation increase (as a percent)	3.40%	3.30%
U. S. Plans
Defined Benefits Pension Benefits
Noncurrent assets	397,000	1,315,000
Current liabilities	(2,076,000)	(2,293,000)
Noncurrent liabilities	(87,853,000)	(42,318,000)
Accumulated other comprehensive loss before tax	149,429,000	101,909,000
Amounts recognized in accumulated other comprehensive loss
Net actuarial loss	148,690,000	100,924,000
Prior service cost	739,000	985,000
Total	149,429,000	101,909,000
Estimated amounts that will be amortized from accumulated other comprehensive loss into defined benefit net periodic pension cost in the next fiscal year
Net actuarial loss	4,627,000
Prior service cost	189,000
Total	4,816,000
Estimate of expected contributions in next fiscal year	6,900,000
Expected benefit payments for defined benefit plans over next 10 years
2012	16,800,000
2013	18,200,000
2014	18,400,000
2015	17,200,000
2016	18,600,000
2017-2021	90,100,000
Weighted-average actuarial assumptions used to determine net periodic pension cost
Discount rates (as a percent)	5.30%	5.90%	6.10%
Rates of compensation increase (as a percent)	3.00%	3.00%	4.00%
Weighted-average actuarial assumptions used to determine defined benefit pension plan obligations
Discount rates (as a percent)	4.40%	5.30%
Rates of compensation increase (as a percent)	3.00%	3.00%
Number of U.S. dollar-denominated, AA-graded corporate bonds in yield curve universe	500
Highest yield U.S. dollar-denominated, AA-graded corporate bonds excluded from yield curve universe (as a percent)	10.00%
Lowest yield U.S. dollar-denominated, AA-graded corporate bonds excluded from yield curve universe (as a percent)	10.00%
International Plans
Defined Benefits Pension Benefits
Noncurrent assets	4,372,000	4,937,000
Current liabilities	(1,011,000)	(1,064,000)
Noncurrent liabilities	(257,416,000)	(179,190,000)
Accumulated other comprehensive loss before tax	417,406,000	319,879,000
Amounts recognized in accumulated other comprehensive loss
Net actuarial loss	414,203,000	316,561,000
Prior service cost	3,105,000	3,151,000
Transition obligation	98,000	167,000
Total	417,406,000	319,879,000
Estimated amounts that will be amortized from accumulated other comprehensive loss into defined benefit net periodic pension cost in the next fiscal year
Net actuarial loss	14,825,000
Prior service cost	379,000
Transition obligation	50,000
Total	15,254,000
Estimate of expected contributions in next fiscal year	30,200,000
Expected benefit payments for defined benefit plans over next 10 years
2012	38,200,000
2013	39,500,000
2014	40,800,000
2015	42,700,000
2016	44,700,000
2017-2021	$ 250,600,000
Weighted-average actuarial assumptions used to determine net periodic pension cost
Discount rates (as a percent)	5.50%	5.70%	6.00%
Rates of compensation increase (as a percent)	3.30%	3.60%	3.40%
Weighted-average actuarial assumptions used to determine defined benefit pension plan obligations
Discount rates (as a percent)	4.80%	5.50%
Rates of compensation increase (as a percent)	3.40%	3.30%