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Debt (Details Textual)
3 Months Ended9 Months Ended9 Months Ended9 Months Ended9 Months Ended6 Months Ended9 Months Ended9 Months Ended3 Months Ended9 Months Ended
Sep. 30, 2011
USD ($)
Sep. 30, 2011
USD ($)
Dec. 31, 2010
USD ($)
Sep. 30, 2010
USD ($)
Dec. 31, 2009
USD ($)
Sep. 30, 2011
Senior Subordinated Notes [Member]
USD ($)
Dec. 31, 2010
Senior Subordinated Notes [Member]
USD ($)
Sep. 30, 2011
U.S. revolving credit facility [Member]
USD ($)
Sep. 30, 2011
MAC Services Group Limited [Member]
Australian revolving credit facility [Member]
AUD
Sep. 30, 2011
Australian revolving credit facility [Member]
USD ($)
Sep. 30, 2011
Australian revolving credit facility [Member]
AUD
Jul. 13, 2011
Australian revolving credit facility [Member]
AUD
Sep. 30, 2011
Canadian revolving credit facility [Member]
USD ($)
Jun. 30, 2011
6 1/2% senior notes [Member]
USD ($)
Sep. 30, 2011
6 1/2% senior notes [Member]
USD ($)
Jun. 01, 2011
6 1/2% senior notes [Member]
USD ($)
Dec. 31, 2010
6 1/2% senior notes [Member]
USD ($)
Sep. 30, 2011
U.S Term Loan [Member]
USD ($)
Sep. 30, 2011
Canadian Term Loan [Member]
USD ($)
Sep. 30, 2011
6% fixed interest rate unsecured notes payable
Sep. 30, 2011
2 3/8% senior subordinated notes [Member]
USD ($)
Sep. 30, 2010
Maximum [Member]
USD ($)
Sep. 30, 2010
Maximum [Member]
USD ($)
Line of Credit Facility [Line Items]                       
6 1/2% senior unsecured notes maturity dateJun. 01, 2019
Proceeds of senior unsecured notes utilized to repay its senior secured credit facilities             $ 515,000,000         
Proceeds of senior unsecured notes utilized for general corporate purposes             75,000,000         
Revolving credit facility, net00     500,000,00075,000,000 150,000,000150,000,000250,000,000          
Revolving credit facility, net729,600,000729,600,000        119,000,000            
Outstanding letter of credit facilities23,700,00023,700,000       30,200,000             
Senior unsecured notes              6.50%6.50%    2.375%  
Revolving credit facility, average interest rate       2.80% 7.00%7.00% 3.90%          
Term loan     174,990,000175,000,000       600,000,000600,000,0000200,000,000100,000,000    
Aggregate principal repayable per quarter in year one                 1.25%1.25%    
Aggregate principal repayable thereafter                 2.50%2.50%    
Debt Instrument, Interest Rate During Period                 2.60%3.60%    
Fixed interest rate on subordinated unsecured notes payable                   6.00%   
Principal payment on redemption of notes                    10,000  
Capitalized Interest1,600,0004,000,000                   100,000100,000
Debt (Textual) [Abstract]                       
Redemption of senior unsecured notes condition one At any time prior to June 1, 2014 prior to June 1, 2014, the Company may redeem up to 35% of the 6 1/2% Notes at a redemption price of 106.500% of the principal amount, plus accrued and unpaid interest to the redemption date.                     
Maximum Percentage of Notes Redeemed 35.00%                     
Redemption price as percentage of principal amount plus accrued and unpaid interest 106.50%                     
Redemption of senior unsecured notes condition Two Prior to June 1, 2014 the Company may redeem some or all of the 6 1/2% Notes for cash at a redemption price equal to 100% of their principal amount to the redemption date. plus an applicable make-whole premium and accrued and unpaid interest to the redemption date.                     
Redemption price as percentage of principal amount plus an applicable make-whole premium and accrued and unpaid interest 100.00%                     
Conditions for conversion of notes If a note holder chooses to present their notes for conversion during a future quarter prior to the first put/call date in July, 2012. They would receive cash up to $1,000 for each 2 3/8% Note plus Company common stock for any excess valuation over $1,000 using the conversion rate of the 2 3/8% Notes of 31.496 multiplied by the Company’s average common stock price over a ten trading day period following presentation of the 2 3/8% Notes for conversion                     
Shares issued upon exercise of 2 3/8% Notes189189                     
Maximum amount cash received on conversion of Notes 1,000                     
Number of multiples to be multiplied by average common stock price $ 31.496                     
Interest rate of Contingent convertible senior subordinated notes2.375%2.375%   2.375%                 
Effective interest rate 7.17%                     
Closing Stock Price$ 50.92$ 50.92                     
Cash and cash equivalents$ 118,851,000$ 118,851,000$ 96,350,000$ 138,380,000$ 89,742,000