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Long-term Debt and Cash Flow Hedges - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended					1 Months Ended				1 Months Ended	3 Months Ended			1 Months Ended	3 Months Ended				1 Months Ended		1 Months Ended	3 Months Ended				3 Months Ended									3 Months Ended								3 Months Ended								3 Months Ended					3 Months Ended		3 Months Ended						3 Months Ended
	Oct. 31, 2010	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Sep. 21, 2012	May 31, 2012	Sep. 21, 2012 Amendment of Credit Facility Extended Maturity	May 31, 2012 Accounts Receivable Securitization Facility	Mar. 31, 2013 Accounts Receivable Securitization Facility	Oct. 31, 2010 Commercial Paper Rate Plus	Jun. 30, 2006 Senior Notes 7.125%	Mar. 31, 2013 Senior Notes 7.125%	Jun. 30, 2008 Senior Notes 7.125%	Mar. 31, 2013 ABR-based loans	Sep. 29, 2010 7.00% Senior Unsecured Notes	Mar. 31, 2013 7.00% Senior Unsecured Notes	Sep. 29, 2010 7.00% Senior Unsecured Notes Debtor Optional Redemption Period 1	Sep. 29, 2010 7.00% Senior Unsecured Notes Debtor Optional Redemption Period 2	Sep. 29, 2010 7.00% Senior Unsecured Notes Debtor Optional Redemption Period 3	Sep. 21, 2012 Term Loan- A2	Mar. 31, 2013 Term Loan- A2	Sep. 21, 2012 Term Loan- A2 Amendment of Credit Facility	Mar. 31, 2013 Term Loan- A2 First Quarter [Member]	Mar. 31, 2013 Term Loan- A2 Payments Due in Remaining Nine Months of Twenty Thirteen [Member]	Mar. 31, 2013 Term Loan- A2 Payments Due in Twenty Fourteen [Member]	Mar. 31, 2013 Term Loan- A2 Eurodollar Based Loans	Mar. 31, 2013 Revolving Credit Facility	Sep. 21, 2012 Revolving Credit Facility	Nov. 15, 2010 Revolving Credit Facility Amendment of Credit Facility	Sep. 21, 2012 Revolving Credit Facility Amendment of Credit Facility Extended Maturity	Mar. 31, 2013 Revolving Credit Facility One Month Eurodollar Rate Plus Index Based Loans Minimum	Mar. 31, 2013 Revolving Credit Facility One Month Eurodollar Rate Plus Index Based Loans Maximum	Mar. 31, 2013 Revolving Credit Facility One Two Three Six Month Eurodollar Rate Plus Index Based Loans Minimum	Mar. 31, 2013 Revolving Credit Facility One Two Three Six Month Eurodollar Rate Plus Index Based Loans Maximum	Mar. 31, 2013 Revolving Credit Facility Eurodollar Based Loans	Mar. 31, 2013 Term Loan A	Sep. 21, 2012 Term Loan A	Sep. 21, 2012 Term Loan A Amendment of Credit Facility Extended Maturity	Mar. 31, 2013 Term Loan A One Month Eurodollar Rate Plus Index Based Loans Minimum	Mar. 31, 2013 Term Loan A One Month Eurodollar Rate Plus Index Based Loans Maximum	Mar. 31, 2013 Term Loan A One Two Three Six Month Eurodollar Rate Plus Index Based Loans Minimum	Mar. 31, 2013 Term Loan A One Two Three Six Month Eurodollar Rate Plus Index Based Loans Maximum	Mar. 31, 2013 Term Loan A Eurodollar Based Loans	Mar. 31, 2013 Term Loan B Facility	Sep. 21, 2012 Term Loan B Facility	Mar. 31, 2013 Term Loan B Facility One Month Eurodollar Rate Plus Index Based Loans Minimum	Mar. 31, 2013 Term Loan B Facility One Month Eurodollar Rate Plus Index Based Loans Maximum	Mar. 31, 2013 Term Loan B Facility One Two Three Six Month Eurodollar Rate Plus Index Based Loans Minimum	Mar. 31, 2013 Term Loan B Facility One Two Three Six Month Eurodollar Rate Plus Index Based Loans Maximum	Mar. 31, 2013 Term Loan B Facility Eurodollar Based Loans	Mar. 31, 2013 Short Term on Demand Credit Facility	Mar. 31, 2013 Term Loan A First Quarter [Member]	Mar. 31, 2013 Term Loan A Payments Due in Remaining Nine Months of Twenty Thirteen [Member]	Mar. 31, 2013 Term Loan A Payments Due in Twenty Fourteen [Member]	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 Forward Starting Interest Rate Swaps Derivative	Mar. 31, 2011 One Point Nine One Percent Forward Starting Interest Rate Swaps	Mar. 31, 2011 Two Point Five Zero Percent Forward Starting Interest Rate Swaps	Mar. 31, 2011 One Point Nine Six Percent Forward Starting Interest Rate Swaps	Mar. 31, 2011 One Point Three Two Percent Forward Starting Interest Rate Swaps	Mar. 31, 2013 Interest Rate Swap	Dec. 31, 2012 Interest Rate Swap	Dec. 31, 2010 Interest Rate Swap	Dec. 31, 2010 Two Point Three Eight Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity																						$ 900,000,000					$ 800,000,000		$ 800,000,000
Line of credit facility, maturity date							Aug. 15, 2016															Aug. 15, 2016					Nov. 15, 2015									Nov. 15, 2015
Line of credit facility amount outstanding					3,430,000,000															900,000,000							119,000,000	800,000,000		777,000,000							988,000,000	943,000,000							746,000,000						15,000,000
Line of credit facility, extension period of maturity date							9 months
Line of credit facility, available borrowing capacity																											660,000,000	23,000,000									45,000,000
Proceeds from the new term loan-A2 facility																				700,000,000
Variable interest rate										0.475%											(0.01%)
Variable rate basis																																												1.00%
Costs related to extinguishment of debt																																												29,000,000
Letters of credit, outstanding					125,000,000																						21,000,000
Rate adjustment to weighted average federal funds rate for credit facility borrowings		0.50%
Rate adjustment to one month Eurodollar rate on credit facility borrowings		1.00%
Consolidated leverage ratio																															0.50%	1.25%	1.50%	2.25%					0.50%	1.25%	1.50%	2.25%				1.75%	2.00%	2.75%	3.00%
Current applicable margins														0.75%												1.75%									1.75%								1.75%							2.75%
Scheduled principal payments made		69,926,000	70,942,000																				18,000,000																													18,000,000
Installment Payments due																								54,000,000																													54,000,000
Installment Payments due																									72,000,000																													72,000,000
Accounts receivable securitization program credit facility, borrowing capacity	240,000,000					275,000,000
Accounts receivable securitization program credit facility original amount	200,000,000
Accounts receivable securitization program credit facility, maturity date	Oct. 25, 2013											Jun. 30, 2016				Oct. 01, 2018
Accounts receivable securitization program, increase in size								35,000,000
Credit facility fee, percentage	0.375%
Commitment percentage for facility fee	102.00%
Accounts receivable securitization program credit facility, amount outstanding		257,000,000
Accounts receivable securitization program, additional capacity									18,000,000
Senior notes, issued											250,000,000				250,000,000
Senior notes, interest rate											7.125%				7.00%
Unsecured Notes make-whole redemption price																	103.50%	101.75%	100.00%
Treasury rate plus, basis points															50,000,000
Senior notes, repayment terms											Interest on the 7.125% Notes is payable semiannually in arrears on June 30th and December 30th of each year				Payable semiannually in arrears on April 1st and October 1st of each year
Line of credit facility additional borrowing capacity													150,000,000
Fair value of debt		3,750,000,000
Carrying value of debt		3,670,000,000
Notional amount of interest rate cash flow hedges																																																							450,000,000	400,000,000	425,000,000	225,000,000	100,000,000	25,000,000	75,000,000				600,000,000
Premium paid on interest rate cap				740,000
Derivative cap interest rate				7.00%
Number of additional forward starting interest rate swaps																																																									6
Fixed rate payable on interest rate swap																																																										100.00%	2.50%	1.96%	1.32%				2.38%
Maturity date of interest rate cash flow hedges																																																											Dec. 01, 2014	Dec. 01, 2013	Dec. 01, 2012				May 01, 2015
Number of interest rate swap																																																																4
Fair value of interest rate swap, liability																																																														36,000,000	41,000,000
Fair value of interest rate swap, liability included in accounts payable and accrued liabilities																																																														18,000,000
Fair value of interest rate swap, liability included in other noncurrent liabilities																																																														$ 18,000,000

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Gross amount of debt extinguished.

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Amount borrowed under the credit facility as of the balance sheet date.

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Amount of the total principal payments made during the annual reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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