Long-Term Obligations - Additional Information (Details) (USD $)					0 Months Ended							0 Months Ended							0 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Notes payable	Dec. 31, 2012 Notes payable	May 03, 2013 Credit agreement	Sep. 30, 2013 Credit agreement	Dec. 31, 2012 Credit agreement	Sep. 30, 2011 Credit agreement	Sep. 30, 2013 Term loans payable	May 03, 2013 Term loans payable	Dec. 31, 2012 Term loans payable	Sep. 28, 2012 Receivables securitization facility	Sep. 30, 2013 Receivables securitization facility	Dec. 31, 2012 Receivables securitization facility	Sep. 30, 2013 Other long-term debt	Dec. 31, 2012 Other long-term debt	May 03, 2013 Multicurrency Component Credit agreement	May 03, 2013 US Dollar Component Credit agreement	May 03, 2013 Amended Credit Agreement Credit agreement	May 03, 2013 Original Credit Agreement Credit agreement	May 09, 2013 4.75% Senior Notes Due May 2023
Debt Instrument [Line Items]
Weighted average interest rate			1.80%	1.70%		3.08%	2.85%						1.01%	1.05%	3.50%	3.30%
Senior Secured Credit Agreement [Abstract]
Payments of Financing Costs					$ 7,200,000
Deferred Finance Costs, Noncurrent, Net					6,100,000																9,700,000
Extension period of maturity date for credit agreement					2 years
Maximum credit agreement borrowings					1,800,000,000			1,400,000,000
Maximum revolving credit facility borrowings																	1,200,000,000	150,000,000
Maximum amount of letters of credit					150,000,000			125,000,000
Bridge loan maximum capacity					50,000,000			25,000,000
Maximum increase of revolving credit facility or term loans					400,000,000
Maximum senior secured leverage ratio					2.50
Original principal payment percentage in first and second years					1.25%
Prepayment requirement, duration to reinvest proceeds from sale or disposition of certain assets					12 months
Maximum net leverage ratio					3.50			3.00
Minimum consideration for acquisitions during 12 month period to change the maximum net leverage ratio					200,000,000
Maximum Net Leverage Ratio Subsequent To Acquisitions					4.00			3.50
Minimum interest coverage ratio					3.00
Increment change in applicable margin					0.25%
Increment change in commitment fees					0.05%
Fronting fee on letters of credit in addition to participation commission					0.125%
Current maturities of credit agreement						22,500,000	31,900,000
Outstanding letters of credit						53,200,000
Availability on the revolving credit facility						1,100,000,000
Loss on debt extinguishment																			1,100,000	1,700,000
Senior Notes [Abstract]
Senior notes aggregate principal amount																					600,000,000
Senior notes interest rate																					4.75%
Percent of notes redeemable before May 15, 2016 with net cash proceeds from certain equity offerings																					35.00%
Notes redemption price, percent of principal amount																					100.00%
Period to consummate exchange offer																					365 days
Failure to consummate exchange offer, annual interest rate increase																					0.25%
Failure to consummate exchange offer, for each subsequent default period, additional increase in annual interest rate																					0.25%
Failure to consummate exchange offer, subsequent default period for additional incremental increase in annual interest rate																					90 days
Failure to consummate exchange offer, maximum additional increase in annual interest rate																					1.00%
Receivables Securitization Facility [Abstract]
Debt and capital lease obligations	1,312,055,000	1,118,478,000	38,941,000	42,398,000		644,200,000	974,600,000		444,375,000	450,000,000	420,625,000		10,000,000	80,000,000	18,908,000	21,491,000
Receivables securitization facility term period												3 years
Receivables securitization maximum borrowing capacity												80,000,000
Receivables used as collateral for receivables securitization facility													$ 110,300,000	$ 116,900,000
Margin above LIBOR for receivables secuirtization facility												1.25%