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Long-Term Debt - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
London Interbank Offered Rate (LIBOR)
Jun. 30, 2014
Prime Rate
Jun. 30, 2014
Revolving Credit Facility
Jun. 30, 2014
Revolving Credit Facility
Amendment No.1
Jun. 30, 2014
Revolving Credit Facility
Before Amendment
Jun. 30, 2014
Covenant Requirement
Minimum
Jun. 30, 2014
Covenant Requirement
Maximum
Jun. 30, 2014
Senior Unsecured Notes 5.25 Percent
Jun. 30, 2014
Senior Unsecured Notes 5.0 percent
Jun. 30, 2014
Senior Unsecured Notes 6.875 Percent Due 2020
Debt Instrument [Line Items]                        
Senior notes, aggregate principal amount                   $ 1,300.0   $ 650.0
Debt, interest rate                   5.25% 5.00% 6.875%
Senior notes, net of original issue discount or premiums                   1,313.1   645.9
Debt, due date         2017             2020
Revolving credit facility           1,400.0 950.0          
Borrowings on line of credit 668.0       668.0              
Revolving credit facility, interest rate, additional rate     1.75% 0.75%                
Revolving credit facility agreement Borrowings under the Revolving Credit Facility bear interest at an annual rate equal to the London interbank offered rate ("LIBOR") (as defined in the Revolving Credit Facility) plus 175 basis points or Prime (as defined in the Revolving Credit Facility) plus 75 basis points.                      
Revolving credit facility, average interest rate 1.93%                      
Outstanding letter of credit amount $ 8.2 $ 6.1                    
Interest coverage ratio               200.00%        
Total leverage ratio                 425.00%