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Long-term debt and cash flow hedges - Additional Information (Detail) (USD $) |  |  |  |  |  | 3 Months Ended |  | 3 Months Ended |  |  | 3 Months Ended | 1 Months Ended |  | 1 Months Ended |  |  | 1 Months Ended |  |  |  | 1 Months Ended | 6 Months Ended |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  | 1 Months Ended |  |  |  |  |
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Jun. 30, 2012 | Dec. 31, 2011 | Mar. 31, 2011 | Nov. 15, 2010 | Mar. 31, 2011 Interest Rate Cap from December Twenty Eleven to December Twenty Twelve | Mar. 31, 2011 Interest Rate Cap from December Twenty Twelve to December Twenty Thirteen | Mar. 31, 2011 Interest Rate Swap Derivative | Dec. 31, 2010 Interest Rate Swap Derivative | Dec. 31, 2007 Interest Rate Swap | Jun. 30, 2012 Interest Rate Swap | Mar. 31, 2011 Interest Rate Swap Effective in March Twenty Eleven Derivative | Mar. 31, 2011 Interest Rate Swap One Effective in December Twenty Eleven | Mar. 31, 2011 Interest Rate Swap Two Effective in December Twenty Eleven | Mar. 31, 2011 Interest Rate Swap Three Effective in December Twenty Eleven | Mar. 15, 2011 Federal Funds Rate | Mar. 15, 2011 One Month Eurodollar Rate | Jun. 30, 2012 ABR-based loans | Mar. 31, 2011 Minimum Interest Rate Cap from December Twenty Eleven to December Twenty Twelve | Mar. 31, 2011 Minimum Interest Rate Cap from December Twenty Twelve to December Twenty Thirteen | Mar. 31, 2011 Maximum Interest Rate Cap from December Twenty Eleven to December Twenty Twelve | Mar. 31, 2011 Maximum Interest Rate Cap from December Twenty Twelve to December Twenty Thirteen | Sep. 29, 2010 Senior Unsecured Notes Seven Point Zero Zero Percent | Sep. 29, 2010 Senior Unsecured Notes Seven Point Zero Zero Percent Semi Annual Payment, First Payment | Sep. 29, 2010 Senior Unsecured Notes Seven Point Zero Zero Percent Semi Annual Payment, Second Payment | Sep. 29, 2010 Senior Unsecured Notes Seven Point Zero Zero Percent Treasury Rate | Sep. 29, 2010 Senior Unsecured Notes Seven Point Zero Zero Percent Debtor Optional Redemption Period 1 | Sep. 29, 2010 Senior Unsecured Notes Seven Point Zero Zero Percent Debtor Optional Redemption Period 2 | Sep. 29, 2010 Senior Unsecured Notes Seven Point Zero Zero Percent Debtor Optional Redemption Period 3 | Sep. 29, 2010 Senior Unsecured Notes Seven Point Zero Zero Percent Minimum Debtor Optional Redemption Period 1 | Sep. 29, 2010 Senior Unsecured Notes Seven Point Zero Zero Percent Minimum Debtor Optional Redemption Period 2 | Sep. 29, 2010 Senior Unsecured Notes Seven Point Zero Zero Percent Minimum Debtor Optional Redemption Period 3 | Jun. 30, 2006 Senior Notes Seven Point One Two Five Percent | Jun. 30, 2008 Senior Notes Seven Point One Two Five Percent | Jun. 30, 2006 Senior Notes Seven Point One Two Five Percent Semi Annual Payment, First Payment | Jun. 30, 2006 Senior Notes Seven Point One Two Five Percent Semi Annual Payment, Second Payment | Nov. 15, 2010 Revolving Credit Facility | Jun. 30, 2012 Revolving Credit Facility Euro Dollar Rate | Nov. 15, 2010 Revolving Credit Facility Letter of Credit | Mar. 15, 2011 Revolving Credit Facility Minimum One Month Eurodollar Rate | Mar. 15, 2011 Revolving Credit Facility Minimum Euro Dollar Rate | Mar. 15, 2011 Revolving Credit Facility Maximum One Month Eurodollar Rate | Mar. 15, 2011 Revolving Credit Facility Maximum Euro Dollar Rate | Nov. 15, 2010 Term Loan A | Jun. 30, 2012 Term Loan A | Jun. 30, 2012 Term Loan A Euro Dollar Rate | Mar. 15, 2011 Term Loan A Minimum One Month Eurodollar Rate | Mar. 15, 2011 Term Loan A Minimum Euro Dollar Rate | Mar. 15, 2011 Term Loan A Maximum One Month Eurodollar Rate | Mar. 15, 2011 Term Loan A Maximum Euro Dollar Rate | Mar. 15, 2011 Term Loan B | Nov. 15, 2010 Term Loan B | Mar. 31, 2011 Term Loan B | Jun. 30, 2012 Term Loan B | Jun. 30, 2012 Term Loan B Euro Dollar Rate | Mar. 15, 2011 Term Loan B Minimum One Month Eurodollar Rate | Mar. 15, 2011 Term Loan B Minimum Euro Dollar Rate | Mar. 15, 2011 Term Loan B Maximum One Month Eurodollar Rate | Mar. 15, 2011 Term Loan B Maximum Euro Dollar Rate | Jun. 30, 2012 Term Loan B Before Amendment Minimum Euro Dollar Rate | Jun. 30, 2012 Term Loan B After Amendment Minimum Euro Dollar Rate | Oct. 31, 2010 Accounts Receivable Securitization Facility | Jun. 30, 2012 Accounts Receivable Securitization Facility | May 31, 2012 Accounts Receivable Securitization Facility | Oct. 31, 2010 Accounts Receivable Securitization Facility Commercial Paper Rate | Oct. 31, 2010 Accounts Receivable Securitization Facility Before Amendment | May 31, 2012 Accounts Receivable Securitization Facility After Amendment | Oct. 31, 2010 Accounts Receivable Securitization Facility After Amendment
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior secured facility borrowing capacity |  |  |  | $ 3,450,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000,000 |  | $ 125,000,000 |  |  |  |  | $ 1,050,000,000 |  |  |  |  |  |  |  | $ 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 | $ 275,000,000 | $ 240,000,000
Senior secured facility principal payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,000,000 |  |  |  |  |  |  |  | 125,000,000 | 13,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Nov. 15, 2015 |  |  |  |  |  |  | Nov. 15, 2015 |  |  |  |  |  |  |  | Nov. 15, 2016 |  |  |  |  |  |  |  |  |  | Oct. 25, 2013 |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% | 1.00% |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.475% |  |  |
Consolidated leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.50% | 1.50% | 1.25% | 2.25% |  |  |  | 0.50% | 1.50% | 1.25% | 2.25% |  |  |  |  |  | 1.75% | 2.75% | 2.00% | 3.00% |  |  |  |  |  |  |  |  |
Applicable margin rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  | 1.75% |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  | 1.50% | 1.00% |  |  |  |  |  |  |
Fee paid on amount outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  | 0.375% |  |  |  |  |  |
Available borrowing capacity | 623,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility amount outstanding | 115,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 230,000,000 |  |  |  |  |
Letter of credit amount outstanding | 62,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment percentage for facility fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 102.00% |  |  |  |  |  |
Line of credit facility additional borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,000,000 |  |  |  |  |
Senior secured facility borrowing capacity increased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,000,000 |  |  |  |
Senior notes, issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |  |  | 250,000,000 | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  | 7.125% | 7.125% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 01, 2018 |  |  |  |  |  |  |  |  |  | Jun. 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, frequency of periodic payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Semiannually |  |  |  |  |  |  |  |  |  | Semiannually |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes, interest periodic payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | --04-01 | --10-01 |  |  |  |  |  |  |  |  |  | --06-30 | --12-30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Notes make-whole redemption date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 01, 2014 |  |  |  | Oct. 01, 2014 | Oct. 01, 2015 | Oct. 01, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Notes make-whole redemption price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 103.50% | 101.75% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of debt | 3,458,509,000 | 3,651,428,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of debt | 3,530,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of interest rate cash flow hedges |  |  |  |  | 450,000,000 | 400,000,000 | 425,000,000 | 600,000,000 | 75,000,000 |  | 225,000,000 | 100,000,000 | 25,000,000 | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative effective date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2011-12 | 2012-12 | 2012-12 | 2013-12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium paid on interest rate cap |  |  |  |  |  |  | 740,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative cap interest rate |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of interest rate swap |  |  |  |  |  |  | 6 | 4 |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate maturity |  |  |  |  |  |  |  | 2015-05 | 2012-10 |  | 2015-05 | 2014-12 | 2013-12 | 2012-12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average fixed interest rate |  |  |  |  |  |  |  | 2.38% | 4.76% |  | 1.91% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  | 2.50% | 1.96% | 1.32% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of interest rate swap |  |  |  |  |  |  |  |  |  | 46,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of interest rate swap, current |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of interest rate swap, non-current |  |  |  |  |  |  |  |  |  | $ 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Applicable Margin Rate + References No definition available. + Details
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- Definition Consolidated Leverage Ratio + References No definition available. + Details
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- Definition Debt Instrument, Interest Rate Payment, Day and Month + References No definition available. + Details
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- Definition Debt Instrument, Redemption Price + References No definition available. + Details
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- Definition Derivative Liabilities, Fair Value + References No definition available. + Details
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- Definition Line of Credit Facility, Additional Borrowing Capacity + References No definition available. + Details
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- Definition Line Of Credit Facility Maximum Borrowing Capacity Increase + References No definition available. + Details
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- Definition Percentage Of Commitment Amount + References No definition available. + Details
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- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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