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Long-term Debt and Cash Flow Hedges - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	6 Months Ended				6 Months Ended		1 Months Ended		1 Months Ended		6 Months Ended	1 Months Ended				6 Months Ended			1 Months Ended		6 Months Ended					1 Months Ended			6 Months Ended	1 Months Ended		6 Months Ended				1 Months Ended										6 Months Ended									6 Months Ended					3 Months Ended				3 Months Ended		3 Months Ended		3 Months Ended					3 Months Ended
	Oct. 31, 2010	Mar. 31, 2011	Jun. 30, 2013	Jun. 30, 2012	May 31, 2012	Jun. 30, 2013 Amendment of Credit Facility	Jun. 30, 2013 Amendment of Credit Facility Extended Maturity	Jun. 30, 2013 ABR-based loans	May 31, 2012 Accounts Receivable Securitization Facility	Jun. 30, 2013 Accounts Receivable Securitization Facility	Oct. 31, 2010 Commercial Paper Rate Plus	Sep. 29, 2010 7.00% Senior Unsecured Notes	Jun. 30, 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	Jun. 30, 2006 Senior Notes 7.125%	Jun. 30, 2013 Senior Notes 7.125%	Jun. 30, 2008 Senior Notes 7.125%	May 16, 2013 New Senior Secured Term Loan B-1 Third Amendment	May 31, 2013 New Senior Secured Term Loan B-1 LIBOR Third Amendment	May 31, 2013 New Senior Secured Term Loan B-1 ABR Third Amendment	Jun. 30, 2013 Term Loan B Facility	Jun. 30, 2013 Term Loan B Facility Amendment of Credit Facility	Jun. 30, 2013 Term Loan B Facility LIBOR	Jun. 30, 2013 Term Loan B Facility One Month London Inter Bank Offer Rate Plus Index Based Loans	Jun. 30, 2013 Term Loan B Facility One Two Three Six Month LIBOR Rate Plus Index Based Loans	May 31, 2013 Term Loan B Facility Eliminated LIBOR Minimum Third Amendment	May 31, 2013 Term Loan B Facility Eliminated ABR Minimum Third Amendment	Sep. 21, 2012 Term Loan- A2	Jun. 30, 2013 Term Loan- A2	Sep. 21, 2012 Term Loan- A2 Amendment of Credit Facility	Jun. 30, 2013 Term Loan- A2 Amendment of Credit Facility	Jun. 30, 2013 Term Loan- A2 First Quarter	Jun. 30, 2013 Term Loan- A2 Payments Due in Remaining Nine Months of Twenty Thirteen	Jun. 30, 2013 Term Loan- A2 Payments Due in Twenty Fourteen	Jun. 30, 2013 Term Loan- A2 LIBOR	Sep. 21, 2012 Revolving Credit Facility	Jun. 30, 2013 Revolving Credit Facility	Jun. 30, 2013 Revolving Credit Facility Amendment of Credit Facility	Sep. 21, 2012 Revolving Credit Facility Amendment of Credit Facility	Sep. 21, 2012 Revolving Credit Facility Amendment of Credit Facility Extended Maturity	Jun. 30, 2013 Revolving Credit Facility LIBOR	Jun. 30, 2013 Revolving Credit Facility One Month London Inter Bank Offer Rate Plus Index Based Loans Minimum	Jun. 30, 2013 Revolving Credit Facility One Month London Inter Bank Offer Rate Plus Index Based Loans Maximum	Jun. 30, 2013 Revolving Credit Facility One Two Three Six Month LIBOR Rate Plus Index Based Loans Minimum	Jun. 30, 2013 Revolving Credit Facility One Two Three Six Month LIBOR Rate Plus Index Based Loans Maximum	Jun. 30, 2013 Term Loan A	Jun. 30, 2013 Term Loan A Amendment of Credit Facility	Jun. 30, 2013 Term Loan A Amendment of Credit Facility Extended Maturity	Jun. 30, 2013 Term Loan A LIBOR	Jun. 30, 2013 Term Loan A One Month London Inter Bank Offer Rate Plus Index Based Loans Minimum	Jun. 30, 2013 Term Loan A One Month London Inter Bank Offer Rate Plus Index Based Loans Maximum	Jun. 30, 2013 Term Loan A One Two Three Six Month LIBOR Rate Plus Index Based Loans Minimum	Jun. 30, 2013 Term Loan A One Two Three Six Month LIBOR Rate Plus Index Based Loans Maximum	Jun. 30, 2013 Short Term on Demand Credit Facility	Jun. 30, 2013 Term Loan A First Quarter	Jun. 30, 2013 Term Loan A Payments Due in Remaining Nine Months of Twenty Thirteen	Jun. 30, 2013 Term Loan A Payments Due in Twenty Fourteen	Mar. 31, 2011 Interest Rate Cap from December Twenty Eleven to December Twenty Twelve Cash Flow Hedging	Mar. 31, 2011 Interest Rate Cap from December Twenty Twelve to December Twenty Thirteen Cash Flow Hedging	Mar. 31, 2011 Forward Starting Interest Rate Swaps Derivative	Mar. 31, 2011 Forward Starting Interest Rate Swaps Cash Flow Hedging	Mar. 31, 2011 One Point Nine One Percent Forward Starting Interest Rate Swaps	Mar. 31, 2011 One Point Nine One Percent Forward Starting Interest Rate Swaps Cash Flow Hedging	Mar. 31, 2011 Two Point Five Zero Percent Forward Starting Interest Rate Swaps	Mar. 31, 2011 Two Point Five Zero Percent Forward Starting Interest Rate Swaps Cash Flow Hedging	Mar. 31, 2011 One Point Nine Six Percent Forward Starting Interest Rate Swaps	Mar. 31, 2011 One Point Nine Six Percent Forward Starting Interest Rate Swaps Cash Flow Hedging	Mar. 31, 2011 One Point Three Two Percent Forward Starting Interest Rate Swaps	Mar. 31, 2011 One Point Three Two Percent Forward Starting Interest Rate Swaps Cash Flow Hedging	Jun. 30, 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	Dec. 31, 2010 Two Point Three Eight Percent Forward Starting Interest Rate Swaps Cash Flow Hedging
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity																				$ 745,900,000												$ 900,000,000							$ 800,000,000		$ 800,000,000
Applicable margin above base rate											0.475%										2.25%	1.25%						1.00%	2.00%		1.00%
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																		746,000,000									900,000,000						10,000,000	800,000,000		777,000,000							988,000,000	919,000,000						10,000,000
Line of credit facility, available borrowing capacity																																						23,000,000	769,000,000									44,000,000
Proceeds from the new term loan-A2 facility																														700,000,000
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																										1.25%	2.25%																	0.50%	1.25%	1.50%	2.25%					0.50%	1.25%	1.50%	2.25%
Current applicable margins								0.75%																	2.25%												1.75%						1.75%								1.75%
Scheduled principal payments made			196,096,000	195,686,000																														36,000,000																							36,000,000
Installment Payments due																																			36,000,000																							36,000,000
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												Oct. 01, 2018					Jun. 30, 2016
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			260,000,000
Accounts receivable securitization program, additional capacity										15,000,000
Senior notes, issued												250,000,000					250,000,000
Senior notes, interest rate												7.00%					7.125%
Unsecured Notes make-whole redemption price														103.50%	101.75%	100.00%
Treasury rate plus, basis points												50,000,000
Senior notes, repayment terms												Payable semiannually in arrears on April 1st and October 1st of each year					Interest on the 7.125% Notes is payable semiannually in arrears on June 30th and December 30th of each year
Line of credit facility additional borrowing capacity																			150,000,000
Fair value of debt			3,600,000,000
Carrying value of debt			3,550,000,000
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																																																																1.91%
Fixed rate payable on interest rate swap																																																																		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																																																																								31,000,000	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																																																																								$ 13,000,000

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Date the credit facility terminates, in CCYY-MM-DD format.

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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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