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Long-term debt and cash flow hedges - Additional Information (Detail) - Entity [Domain]
 1 Months Ended 3 Months Ended 6 Months Ended
Aug. 07, 2014
USD ($)
Aug. 01, 2014
USD ($)
Jul. 31, 2014
USD ($)
Jul. 31, 2015
USD ($)
Derivative
Aug. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Derivative
Dec. 31, 2014
USD ($)
Mar. 31, 2011
USD ($)
Derivative
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Oct. 31, 2013
USD ($)
Jun. 30, 2008
USD ($)
Jun. 30, 2006
USD ($)
Debt Instrument [Line Items]                          
Reduction of long-term debt                 $ 255,658,000 $ 179,126,000      
Rate adjustment to weighted average federal funds rate for credit facility borrowings           0.50%     0.50%        
Rate adjustment to one month Eurodollar rate on credit facility borrowings                 1.00%        
Accounts receivable securitization program credit facility, amount outstanding           $ 240,000,000     $ 240,000,000        
Long-term debt           2,961,515,000 $ 3,210,215,000   2,961,515,000        
Fair value of debt           $ 3,100,000,000     $ 3,100,000,000        
Number of additional forward starting interest rate swaps | Derivative           4   7          
Maturity date of interest rate cash flow hedges               May 31, 2015          
Two Point Three Eight Percent Forward Starting Interest Rate Swaps                          
Debt Instrument [Line Items]                          
Fixed rate payable on interest rate swap               2.38%          
One Point Nine One Percent Forward Starting Interest Rate Swaps                          
Debt Instrument [Line Items]                          
Fixed rate payable on interest rate swap               1.91%          
One Point Four Zero Percent Forward Starting Interest Rate Swaps                          
Debt Instrument [Line Items]                          
Maturity date of interest rate cash flow hedges           Apr. 15, 2019              
Fixed rate payable on interest rate swap           1.40%     1.40%        
Interest Rate Swap                          
Debt Instrument [Line Items]                          
Fair value of our interest rate swaps, net           $ 2,000,000     $ 2,000,000        
Fair value of our interest rate swaps, liability           5,000,000 6,000,000   5,000,000        
Fair value of our interest rate swaps, asset           3,000,000     3,000,000        
Cash Flow Hedging                          
Debt Instrument [Line Items]                          
Notional amount of interest rate cash flow hedges               $ 825,000,000          
Cash Flow Hedging | Two Point Three Eight Percent Forward Starting Interest Rate Swaps                          
Debt Instrument [Line Items]                          
Notional amount of interest rate cash flow hedges               600,000,000          
Cash Flow Hedging | One Point Nine One Percent Forward Starting Interest Rate Swaps                          
Debt Instrument [Line Items]                          
Notional amount of interest rate cash flow hedges               $ 225,000,000          
Cash Flow Hedging | One Point Four Zero Percent Forward Starting Interest Rate Swaps                          
Debt Instrument [Line Items]                          
Notional amount of interest rate cash flow hedges           $ 500,000,000     $ 500,000,000        
Subsequent Event                          
Debt Instrument [Line Items]                          
Number of additional forward starting interest rate swaps | Derivative       2                  
Subsequent Event | One Point Three Zero Percent Forward Starting Interest Rate Swaps                          
Debt Instrument [Line Items]                          
Maturity date of interest rate cash flow hedges       Apr. 15, 2019                  
Average fixed rate payable on interest rate swap       1.30%                  
Subsequent Event | Cash Flow Hedging | Forward Starting Interest Rate Swaps                          
Debt Instrument [Line Items]                          
Notional amount of interest rate cash flow hedges       $ 200,000,000                  
One Point Three Zero Percent Forward Starting Interest Rate Swaps | Subsequent Event | Cash Flow Hedging | One Point Three Zero Percent Forward Starting Interest Rate Swaps                          
Debt Instrument [Line Items]                          
Notional amount of interest rate cash flow hedges       100,000,000                  
One Point Three Zero Percent Forward Starting Interest Rate Swaps | Subsequent Event | Cash Flow Hedging | One Point Three Zero Percent Forward Starting Interest Rate Swaps                          
Debt Instrument [Line Items]                          
Notional amount of interest rate cash flow hedges       $ 100,000,000                  
ABR-based loans                          
Debt Instrument [Line Items]                          
Current applicable margins           0.50%     0.50%        
3.750% Senior Secured Notes due 2019                          
Debt Instrument [Line Items]                          
Senior notes, issued $ 300,000,000                        
Senior notes, interest rate 3.75%                        
4.750% Senior Secured Notes due 2022                          
Debt Instrument [Line Items]                          
Senior notes, issued $ 300,000,000                        
Senior notes, interest rate 4.75%                        
Senior Notes 7.125%                          
Debt Instrument [Line Items]                          
Senior notes, issued                         $ 250,000,000
Senior notes, interest rate                         7.125%
Senior notes, maturity date                 Jun. 30, 2016        
Line of credit facility additional borrowing capacity                       $ 150,000,000  
Senior notes, repayment terms                 Interest on the 7.125% Notes is payable semiannually in arrears on June 30th and December 30th of each year.        
7.00% Senior Unsecured Notes                          
Debt Instrument [Line Items]                          
Reduction of long-term debt     $ 250,000,000                    
Senior notes, interest rate     7.00%                    
Debt instrument redemption, date     Jul. 31, 2014           Jul. 31, 2014        
Unsecured notes make-whole redemption price     104.56%                    
Senior notes, maturity date                 Oct. 01, 2018        
Write-off deferred charges, original issue discount and make-whole premiums paid     $ 11,000,000                    
Accounts Receivable Securitization Facility                          
Debt Instrument [Line Items]                          
Accounts receivable securitization program, additional capacity           $ 120,000,000     $ 120,000,000        
Amendment of Credit Facility                          
Debt Instrument [Line Items]                          
Line of credit facility, starting date         Aug. 07, 2014                
Line of credit facility, maturity         2019-08                
Accounts receivable securitization program credit facility, borrowing capacity   $ 360,000,000                 $ 275,000,000    
Amendment of Credit Facility | Accounts Receivable Securitization Facility                          
Debt Instrument [Line Items]                          
Line of credit facility, starting date   Aug. 01, 2014                      
Line of credit facility, maturity   2016-10                      
Term Loan A                          
Debt Instrument [Line Items]                          
Current applicable margins           1.50%     1.50%        
Term Loan A | One Month Eurodollar Rate Plus Index Based Loans | Minimum                          
Debt Instrument [Line Items]                          
Consolidated leverage ratio           0.50%     0.50%        
Term Loan A | One Month Eurodollar Rate Plus Index Based Loans | Maximum                          
Debt Instrument [Line Items]                          
Consolidated leverage ratio           1.25%     1.25%        
Term Loan A | One Two Three Six Month Eurodollar Rate Plus Index Based Loans | Minimum                          
Debt Instrument [Line Items]                          
Consolidated leverage ratio           1.50%     1.50%        
Term Loan A | One Two Three Six Month Eurodollar Rate Plus Index Based Loans | Maximum                          
Debt Instrument [Line Items]                          
Consolidated leverage ratio           2.25%     2.25%        
Term Loan A | Quarterly installment payments commence in the fourth quarter of 2014 through September, 2016                          
Debt Instrument [Line Items]                          
Scheduled principal payments made             11,000,000            
Term Loan A | Quarterly installment payments after September, 2016                          
Debt Instrument [Line Items]                          
Scheduled principal payments made             $ 22,000,000            
Term Loan A | Amendment of Credit Facility                          
Debt Instrument [Line Items]                          
Line of credit facility, borrowing capacity         $ 1,775,000,000                
Line of credit facility amount outstanding           $ 1,742,000,000     $ 1,742,000,000        
New Senior Secured Notes                          
Debt Instrument [Line Items]                          
Senior notes, interest payment, commencement date                 Feb. 01, 2015        
New Senior Secured Notes | 3.750% Senior Secured Notes due 2019                          
Debt Instrument [Line Items]                          
Senior notes, issued $ 300,000,000                        
Senior notes, interest rate 3.75%                        
Senior notes, maturity date                 Aug. 01, 2019        
New Senior Secured Notes | 4.750% Senior Secured Notes due 2022                          
Debt Instrument [Line Items]                          
Senior notes, issued $ 300,000,000                        
Senior notes, interest rate 4.75%                        
Senior notes, maturity date                 Aug. 01, 2022        
Revolving Credit Facility                          
Debt Instrument [Line Items]                          
Line of credit facility, borrowing capacity           800,000,000     $ 800,000,000        
Line of credit facility amount outstanding           $ 0     $ 0        
Current applicable margins           1.50%     1.50%        
Line of credit facility, available borrowing capacity           $ 755,000,000     $ 755,000,000        
Letters of credit, outstanding           $ 39,000,000     $ 39,000,000        
Revolving Credit Facility | One Month Eurodollar Rate Plus Index Based Loans | Minimum                          
Debt Instrument [Line Items]                          
Consolidated leverage ratio           0.50%     0.50%        
Revolving Credit Facility | One Month Eurodollar Rate Plus Index Based Loans | Maximum                          
Debt Instrument [Line Items]                          
Consolidated leverage ratio           1.25%     1.25%        
Revolving Credit Facility | One Two Three Six Month Eurodollar Rate Plus Index Based Loans | Minimum                          
Debt Instrument [Line Items]                          
Consolidated leverage ratio           1.50%     1.50%        
Revolving Credit Facility | One Two Three Six Month Eurodollar Rate Plus Index Based Loans | Maximum                          
Debt Instrument [Line Items]                          
Consolidated leverage ratio           2.25%     2.25%        
Revolving Credit Facility | Short Term on Demand Credit Facility                          
Debt Instrument [Line Items]                          
Line of credit facility amount outstanding           $ 6,000,000     $ 6,000,000        
Revolving Credit Facility | Letter of Credit                          
Debt Instrument [Line Items]                          
Line of credit facility, borrowing capacity           $ 125,000,000     $ 125,000,000        
Revolving Credit Facility | Amendment of Credit Facility                          
Debt Instrument [Line Items]                          
Line of credit facility, borrowing capacity         $ 800,000,000                
Term Loan B Facility                          
Debt Instrument [Line Items]                          
Reduction of long-term debt $ 550,000,000                        
Line of credit facility, maturity year 2016