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Debt (Details) (USD $)
 0 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Mar. 18, 2013
Subsidiaries [Member]
Sep. 30, 2014
Revolving Credit Facility [Member]
Dec. 31, 2013
Revolving Credit Facility [Member]
Sep. 30, 2014
Revolving Credit Facility [Member]
Base Rate [Member]
Sep. 30, 2014
Revolving Credit Facility [Member]
London Interbank Offered Rate (LIBOR) [Member]
Dec. 31, 2013
Revolving Credit Facility [Member]
London Interbank Offered Rate (LIBOR) [Member]
Sep. 30, 2014
2012 Credit Agreement [Member]
Oct. 17, 2014
2012 Credit Agreement [Member]
Subsequent Event [Member]
Sep. 30, 2014
2012 Credit Agreement [Member]
Debt Instrument, Redemption, Period One [Member]
Sep. 30, 2014
2012 Credit Agreement [Member]
Term A Facility [Member]
Sep. 30, 2014
2012 Credit Agreement [Member]
Term A Facility [Member]
Dec. 31, 2013
2012 Credit Agreement [Member]
Term A Facility [Member]
Sep. 30, 2014
2012 Credit Agreement [Member]
Term A Facility [Member]
Debt Instrument, Redemption, Period One [Member]
Sep. 30, 2014
2012 Credit Agreement [Member]
Term A Facility [Member]
Debt Instrument, Redemption, Period Two [Member]
Sep. 30, 2014
2012 Credit Agreement [Member]
Term A Facility [Member]
London Interbank Offered Rate (LIBOR) [Member]
Dec. 31, 2013
2012 Credit Agreement [Member]
Term A Facility [Member]
London Interbank Offered Rate (LIBOR) [Member]
Sep. 30, 2014
2012 Credit Agreement [Member]
Term B Facility [Member]
Sep. 30, 2014
2012 Credit Agreement [Member]
Term B Facility [Member]
Dec. 31, 2013
2012 Credit Agreement [Member]
Term B Facility [Member]
Sep. 30, 2014
2012 Credit Agreement [Member]
Term B Facility [Member]
London Interbank Offered Rate (LIBOR) [Member]
Sep. 30, 2014
Senior Notes [Member]
Dec. 31, 2013
Senior Notes [Member]
Sep. 30, 2014
Convertible Notes payable [Member]
Dec. 31, 2013
Convertible Notes payable [Member]
Sep. 30, 2014
Capital Lease Obligations [Member]
Dec. 31, 2013
Capital Lease Obligations [Member]
Sep. 30, 2014
Capital Lease Obligations [Member]
Minimum [Member]
Sep. 30, 2014
Capital Lease Obligations [Member]
Maximum [Member]
Long-term Debt, by Current and Noncurrent [Abstract]                                                                
Line of credit           $ 54,000,000 $ 74,500,000               $ 491,200,000 $ 522,500,000           $ 595,900,000 $ 737,300,000                  
Senior notes                                                 375,000,000 375,000,000            
Convertible notes payable                                                     103,400,000 99,600,000        
Capital lease obligations and other                                                         27,300,000 27,600,000    
Total debt   1,646,800,000   1,836,500,000                                                        
Less current portion   (60,200,000)   (39,600,000)                                                        
Long-term debt   1,586,600,000   1,796,900,000                                                        
Line of Credit Facility [Abstract]                                                                
Index rate or LIBOR plus (in hundredths)               2.25% 3.00% 3.25%                 2.25% 2.50%       2.75%                
Interest rate floor                                               0.75%                
Principal borrowing capacity, maximum           350,000,000                 550,000,000             870,000,000                    
Interest rate at period end               5.25% 3.15%                   2.40%         3.50%                
Borrowings, line of credit   239,500,000 2,917,600,000     239,500,000                                                    
Repayment of line of credit   432,700,000 1,559,100,000     260,000,000                 31,300,000             141,400,000                    
Letters of credit outstanding                     17,100,000                                          
Remaining borrowing capacity             278,900,000                                                  
Quarterly payments                         1,800,000       6,800,000 13,500,000                            
Balloon payment                             322,300,000             557,600,000                    
Prepayments                           1,900,000 9,100,000           123,100,000 12,800,000                    
Accelerated amortization 3,300,000                                                              
Debt basket                       50,000,000                                        
Domestic qualified cash excluded (in hundredths)                     100.00%                                          
Foreign qualified cash excluded (in hundredths)                     60.00%                                          
Domestic and foreign qualified cash exclusions, maximum                     150,000,000                                          
Domestic qualified cash                     41,000,000                                          
Foreign qualified cash                     24,500,000                                          
Debt Instruments [Abstract]                                                                
Stated percentage (in hundredths)                                                 6.875%   8.00%          
Line of credit facility, initiation date                                                 Dec. 19, 2012              
Line of credit facility, expiration date                                                 Dec. 15, 2020   Jul. 15, 2016          
Percentage of notes outstanding                                                     83.00%          
Debt convertible ratio, period I                                                     2,325.43          
Debt convertible ratio numerator                                                     1,000          
Debt convertible ratio, period II                                                     2,200          
Aggregate principal amount remaining                                                     17.00%          
Fair value of notes as of period start         96,200,000                                                      
Carrying value of notes as of period end                                                     103,400,000          
Accreted discount                                                     $ 7,500,000          
Remaining terms of leases                                                             8 years 10 years
Interest rate swap period   4 years