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Long-term debt and cash flow hedges - Additional Information (Detail) (USD $)	3 Months Ended			9 Months Ended		12 Months Ended				9 Months Ended		0 Months Ended		3 Months Ended	9 Months Ended			0 Months Ended						3 Months Ended			12 Months Ended																				0 Months Ended	3 Months Ended	9 Months Ended		9 Months Ended				0 Months Ended		9 Months Ended			9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2011 Derivative	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2010 Derivative	Dec. 31, 2013	Sep. 30, 2014 Revolving Credit Facility	Sep. 30, 2014 Term Loan A	Sep. 30, 2014 Term Loan A Quarterly installment payments commence in the fourth quarter of 2014 through September, 2016	Sep. 30, 2014 Term Loan A Quarterly installment payments after September, 2016	Aug. 07, 2014 Term Loan B Facility	Sep. 30, 2014 Previous Credit Facility	Sep. 30, 2013 Term Loan-A and Term Loan A2 facilities	Sep. 30, 2014 Term Loan-A and Term Loan A2 facilities	Sep. 30, 2013 Term Loan-A and Term Loan A2 facilities	Sep. 30, 2014 New Senior Secured Notes	Aug. 07, 2014 Amendment of Credit Facility	Aug. 01, 2014 Amendment of Credit Facility	Oct. 31, 2013 Amendment of Credit Facility	Aug. 07, 2014 Amendment of Credit Facility Revolving Credit Facility	Aug. 07, 2014 Amendment of Credit Facility Term Loan A	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	Dec. 31, 2010 Two Point Three Eight Percent Forward Starting Interest Rate Swaps	Sep. 30, 2014 Interest Rate Swap	Dec. 31, 2013 Interest Rate Swap	Sep. 30, 2014 Short Term on Demand Credit Facility Revolving Credit Facility	Sep. 30, 2014 Letter of Credit Revolving Credit Facility	Mar. 31, 2011 Cash Flow Hedging Forward Starting Interest Rate Swaps	Mar. 31, 2011 Cash Flow Hedging One Point Nine One Percent Forward Starting Interest Rate Swaps	Mar. 31, 2011 Cash Flow Hedging Two Point Five Zero Percent Forward Starting Interest Rate Swaps	Mar. 31, 2011 Cash Flow Hedging One Point Nine Six Percent Forward Starting Interest Rate Swaps	Mar. 31, 2011 Cash Flow Hedging One Point Three Two Percent Forward Starting Interest Rate Swaps	Dec. 31, 2010 Cash Flow Hedging Two Point Three Eight Percent Forward Starting Interest Rate Swaps	Sep. 30, 2014 ABR-based loans	Sep. 30, 2014 Minimum One Month Eurodollar Rate Plus Index Based Loans Revolving Credit Facility	Sep. 30, 2014 Minimum One Month Eurodollar Rate Plus Index Based Loans Term Loan A	Sep. 30, 2014 Minimum One Two Three Six Month Eurodollar Rate Plus Index Based Loans Revolving Credit Facility	Sep. 30, 2014 Minimum One Two Three Six Month Eurodollar Rate Plus Index Based Loans Term Loan A	Sep. 30, 2014 Maximum One Month Eurodollar Rate Plus Index Based Loans Revolving Credit Facility	Sep. 30, 2014 Maximum One Month Eurodollar Rate Plus Index Based Loans Term Loan A	Sep. 30, 2014 Maximum One Two Three Six Month Eurodollar Rate Plus Index Based Loans Revolving Credit Facility	Sep. 30, 2014 Maximum One Two Three Six Month Eurodollar Rate Plus Index Based Loans Term Loan A	Jul. 31, 2014 7.00% Senior Unsecured Notes	Sep. 30, 2014 7.00% Senior Unsecured Notes	Sep. 30, 2014 7.00% Senior Unsecured Notes	Jul. 31, 2014 7.00% Senior Unsecured Notes	Sep. 30, 2014 Senior Notes 7.125%	Jun. 30, 2008 Senior Notes 7.125%	Jun. 30, 2006 Senior Notes 7.125%	Sep. 30, 2014 Accounts Receivable Securitization Facility	Aug. 01, 2014 Accounts Receivable Securitization Facility Amendment of Credit Facility	Aug. 07, 2014 Three Point Seven Five Zero Percent Senior Secured Notes Due 2019	Sep. 30, 2014 Three Point Seven Five Zero Percent Senior Secured Notes Due 2019 New Senior Secured Notes	Aug. 07, 2014 Three Point Seven Five Zero Percent Senior Secured Notes Due 2019 New Senior Secured Notes	Aug. 07, 2014 Four Point Seven Five Zero Percent Senior Secured Notes Due 2022	Sep. 30, 2014 Four Point Seven Five Zero Percent Senior Secured Notes Due 2022 New Senior Secured Notes	Aug. 07, 2014 Four Point Seven Five Zero Percent Senior Secured Notes Due 2022 New Senior Secured Notes	Dec. 31, 2013 Accounts Payable and Accrued Liabilities Interest Rate Swap	Dec. 31, 2013 Other Noncurrent Liabilities Interest Rate Swap
Debt Instrument [Line Items]
Line of credit facility, starting date																		Aug. 07, 2014																																					Aug. 01, 2014
Line of credit facility, maturity month																		2019-08
Line of credit facility, borrowing capacity								$ 800,000,000													$ 800,000,000	$ 1,775,000,000									$ 125,000,000
Reduction of long-term debt				842,543,000	234,231,000							550,000,000																																			250,000,000		250,000,000
Line of credit facility, maturity year												2016
Accounts receivable securitization program credit facility, borrowing capacity																			360,000,000	275,000,000
Line of credit facility, maturity date																																																							Oct. 25, 2016
Senior notes, issued																																																					250,000,000			300,000,000		300,000,000	300,000,000		300,000,000
Senior notes, interest rate																																																7.00%	7.00%	7.00%			7.125%			3.75%		3.75%	4.75%		4.75%
Debt instrument redemption, date																																															Jul. 31, 2014		Jul. 31, 2014
Unsecured notes make-whole redemption price																																															104.56%
Costs related to extinguishment of debt	36,171,000	0		36,171,000	0
Write-off deferred charges, original issue discount and make-whole premiums paid																																															11,000,000	11,000,000	11,000,000
Write-off deferred charges				19,730,000	0																																											20,000,000	20,000,000
Original issue discount on the extinguished debt																																																5,000,000	5,000,000
Line of credit facility amount outstanding								267,000,000	1,775,000,000				267,000,000																	35,000,000
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%
Consolidated leverage ratio																																							0.50%	0.50%	1.50%	1.50%	1.25%	1.25%	2.25%	2.25%
Current applicable margins								1.50%	1.50%																													0.50%
Line of credit facility, available borrowing capacity								478,000,000
Letters of credit, outstanding								20,000,000
Scheduled principal payments made										11,000,000	22,000,000			18,000,000	36,000,000	54,000,000
Accounts receivable securitization program credit facility, amount outstanding	333,000,000			333,000,000
Accounts receivable securitization program, additional capacity																																																						27,000,000
Senior notes, repayment terms																	Interest is payable on the New Senior Secured Notes on February 1 and August 1 of each year																																		Interest on the 7.125% Notes is payable semiannually in arrears on June 30th and December 30th of each year
Senior notes, interest payment, commencement date																	Feb. 01, 2015
Senior notes, maturity date																																																	Oct. 01, 2018		Jun. 30, 2016						Aug. 01, 2019			Aug. 01, 2022
Line of credit facility additional borrowing capacity																																																				150,000,000
Fair value of debt	3,450,000,000			3,450,000,000
Long-term debt	3,373,341,000			3,373,341,000			3,209,762,000
Number of additional forward starting interest rate swaps			6			4
Notional amount of interest rate cash flow hedges																																425,000,000	225,000,000	100,000,000	25,000,000	75,000,000	600,000,000
Average 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
Fair value of our interest rate swaps, liability																												$ 11,000,000	$ 24,000,000																																	$ 19,000,000	$ 5,000,000

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644



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-Section 50

-Paragraph 1

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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This is the principal amount outstanding for securitized loans only (across all types of loans).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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