Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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Interest Rate Margin Adjustment Percentage

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Line of Credit Facility, Additional Borrowing Capacity

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Securitized borrowings credit facility borrowing capacity.

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Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

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Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of the required periodic payments applied to principal.

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Start date of debt instrument redemption period, in CCYY-MM-DD format.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Average fixed interest rate related to the group of interest rate derivatives.

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Fixed interest rate related to the interest rate derivative.

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Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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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.

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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.

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

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

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Long-term debt and cash flow hedges - Additional Information (Detail) (USD $)	3 Months Ended			12 Months Ended	3 Months Ended	0 Months Ended	1 Months Ended	0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2011 Derivative	Dec. 31, 2010 Derivative	Dec. 31, 2014	Aug. 07, 2014	Aug. 30, 2014	Aug. 01, 2014	Jul. 31, 2014	Oct. 31, 2013	Jun. 30, 2008	Jun. 30, 2006
Debt Instrument [Line Items]
Reduction of long-term debt	$ 158,871,000us-gaap_RepaymentsOfLongTermDebt	$ 109,054,000us-gaap_RepaymentsOfLongTermDebt
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%
Accounts receivable securitization program credit facility, amount outstanding	325,000,000
Long-term debt	3,051,571,000us-gaap_LongTermDebtNoncurrent				3,210,215,000us-gaap_LongTermDebtNoncurrent
Fair value of debt	3,200,000,000us-gaap_LongTermDebtFairValue
Number of additional forward starting interest rate swaps			6	4
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity	800,000,000
Line of credit facility amount outstanding	0
Current applicable margins	1.50%
Line of credit facility, available borrowing capacity	739,000,000
Letters of credit, outstanding	40,000,000
Term Loan A
Debt Instrument [Line Items]
Current applicable margins	1.50%
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 B Facility
Debt Instrument [Line Items]
Reduction of long-term debt						550,000,000
Line of credit facility, maturity year						2016
New Senior Secured Notes
Debt Instrument [Line Items]
Senior notes, repayment terms	Interest is payable on the New Senior Secured Notes on February 1 and August 1 of each year
Senior notes, interest payment, commencement date	Feb. 01, 2015
One Point Nine One Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Average fixed rate payable on interest rate swap			1.91%
Two Point Five Zero Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Maturity date of interest rate cash flow hedges			Dec. 01, 2014
Fixed rate payable on interest rate swap			2.50%
One Point Nine Six Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Maturity date of interest rate cash flow hedges			Dec. 01, 2013
One Point Three Two Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Maturity date of interest rate cash flow hedges			Dec. 01, 2012
Two Point Three Eight Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Maturity date of interest rate cash flow hedges				May 01, 2015
Fixed rate payable on interest rate swap				2.38%
Interest Rate Swap
Debt Instrument [Line Items]
Fair value of our interest rate swaps, liability	2,000,000				6,000,000
Cash Flow Hedging \| Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Notional amount of interest rate cash flow hedges			425,000,000
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 \| Two Point Five Zero Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Notional amount of interest rate cash flow hedges			100,000,000
Cash Flow Hedging \| One Point Nine Six Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Notional amount of interest rate cash flow hedges			25,000,000
Cash Flow Hedging \| One Point Three Two Percent Forward Starting Interest Rate Swaps
Debt Instrument [Line Items]
Notional amount of interest rate cash flow hedges			75,000,000
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
One Month Eurodollar Rate Plus Index Based Loans \| Minimum \| Revolving Credit Facility
Debt Instrument [Line Items]
Consolidated leverage ratio	0.50%
One Month Eurodollar Rate Plus Index Based Loans \| Minimum \| Term Loan A
Debt Instrument [Line Items]
Consolidated leverage ratio	0.50%
One Month Eurodollar Rate Plus Index Based Loans \| Maximum \| Revolving Credit Facility
Debt Instrument [Line Items]
Consolidated leverage ratio	1.25%
One Month Eurodollar Rate Plus Index Based Loans \| Maximum \| Term Loan A
Debt Instrument [Line Items]
Consolidated leverage ratio	1.25%
One Two Three Six Month Eurodollar Rate Plus Index Based Loans \| Minimum \| Revolving Credit Facility
Debt Instrument [Line Items]
Consolidated leverage ratio	1.50%
One Two Three Six Month Eurodollar Rate Plus Index Based Loans \| Minimum \| Term Loan A
Debt Instrument [Line Items]
Consolidated leverage ratio	1.50%
One Two Three Six Month Eurodollar Rate Plus Index Based Loans \| Maximum \| Revolving Credit Facility
Debt Instrument [Line Items]
Consolidated leverage ratio	2.25%
One Two Three Six Month Eurodollar Rate Plus Index Based Loans \| Maximum \| Term Loan A
Debt Instrument [Line Items]
Consolidated leverage ratio	2.25%
ABR-based loans
Debt Instrument [Line Items]
Current applicable margins	0.50%
Short Term on Demand Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility amount outstanding	21,000,000
Letter of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity	125,000,000
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 \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity							800,000,000
Amendment of Credit Facility \| Term Loan A
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity							1,775,000,000
Line of credit facility amount outstanding	1,753,000,000
Accounts Receivable Securitization Facility
Debt Instrument [Line Items]
Accounts receivable securitization program, additional capacity	35,000,000
Accounts Receivable Securitization Facility \| Amendment of Credit Facility
Debt Instrument [Line Items]
Line of credit facility, starting date								Aug. 01, 2014
Line of credit facility, maturity								2016-10
3.750% Senior Secured Notes due 2019
Debt Instrument [Line Items]
Senior notes, issued						300,000,000
Senior notes, interest rate						3.75%
3.750% Senior Secured Notes due 2019 \| New Senior Secured Notes
Debt Instrument [Line Items]
Senior notes, issued						300,000,000
Senior notes, interest rate						3.75%
Senior notes, maturity date	Aug. 01, 2019
4.750% Senior Secured Notes due 2022
Debt Instrument [Line Items]
Senior notes, issued						300,000,000
Senior notes, interest rate						4.75%
4.750% Senior Secured Notes due 2022 \| New Senior Secured Notes
Debt Instrument [Line Items]
Senior notes, issued						300,000,000
Senior notes, interest rate						4.75%
Senior notes, maturity date	Aug. 01, 2022
Senior Notes 7.125%
Debt Instrument [Line Items]
Senior notes, issued												250,000,000
Senior notes, interest rate												7.125%
Senior notes, repayment terms	Interest on the 7.125% Notes is payable semiannually in arrears on June 30th and December 30th of each year.
Senior notes, maturity date	Jun. 30, 2016
Line of credit facility additional borrowing capacity											150,000,000
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