Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
U.S. Plans
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 1,887	$ 1,557	$ 2,086
Interest cost	12,780	13,468	14,049
Expected return on plan assets	(15,617)	(16,480)	(16,632)
Recognized prior service costs	224	245	339
Recognized losses	4,637	2,982	2,537
Amortization of transition liability	0	0	0
Settlement/curtailment loss (gain)	1,510	0	179
Defined benefit plans pension cost	5,421	1,772	2,558
Multiemployer plans	10,186	13,264	10,924
Defined contribution plans	5,066	5,434	5,918
Net periodic pension cost	20,673	20,470	19,400
U.S. Plans | Maximum
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer matching contribution (as a percent)	4.00%
Employer discretionary contribution (as a percent)	2.00%
International Plans
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Additional contribution towards insurance and administrative costs (as a percent)	2.00%
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	3,418	4,350	4,052
Interest cost	46,174	48,768	47,558
Expected return on plan assets	(45,050)	(52,735)	(46,079)
Recognized prior service costs	397	424	327
Recognized losses	15,194	11,332	12,077
Amortization of transition liability	8	43	45
Settlement/curtailment loss (gain)	(2,589)	183	(210)
Defined benefit plans pension cost	17,552	12,365	17,770
Multiemployer plans	5,539	6,547	6,396
Defined contribution plans	12,770	14,157	13,298
Net periodic pension cost	$ 35,861	$ 33,069	$ 37,464
International Plans | Maximum
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer matching contribution (as a percent)	6.00%