Long-Term Debt - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 07, 2014	Jul. 31, 2014	Aug. 01, 2014	Jun. 30, 2008	Jun. 30, 2006	Oct. 31, 2013
Debt Instrument [Line Items]
Reduction of long-term debt	$ 879,129,000	$ 440,224,000	$ 849,647,000
Costs related to extinguishment of debt	36,171,000	0	29,170,000
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%
Accounts receivable securitization program credit facility, amount outstanding	330,000,000
Effective interest rate	3.20%	3.60%	4.50%
Long-term debt	3,210,215,000	3,209,762,000
Fair value of debt	3,300,000,000	3,400,000,000
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
Term Loan-A and Term Loan A2 facilities
Debt Instrument [Line Items]
Scheduled principal payments made	36,000,000	72,000,000
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
ABR-based loans
Debt Instrument [Line Items]
Current applicable margins	0.50%
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity	800,000,000
Line of credit facility amount outstanding	140,000,000
Current applicable margins	1.50%
Line of credit facility, available borrowing capacity	640,000,000
Letters of credit, outstanding	20,000,000
Revolving Credit Facility | One Month Eurodollar Rate Plus Index Based Loans | Minimum
Debt Instrument [Line Items]
Consolidated leverage ratio	0.50%
Revolving Credit Facility | One Month Eurodollar Rate Plus Index Based Loans | Maximum
Debt Instrument [Line Items]
Consolidated leverage ratio	1.25%
Revolving Credit Facility | One Two Three Six Month Eurodollar Rate Plus Index Based Loans | Minimum
Debt Instrument [Line Items]
Consolidated leverage ratio	1.50%
Revolving Credit Facility | One Two Three Six Month Eurodollar Rate Plus Index Based Loans | Maximum
Debt Instrument [Line Items]
Consolidated leverage ratio	2.25%
Term Loan A
Debt Instrument [Line Items]
Line of credit facility amount outstanding	1,761,872,000	935,308,000
Original issue discount on the extinguished debt	2,035,000	3,340,000
Current applicable margins	1.50%
Term Loan A | One Month Eurodollar Rate Plus Index Based Loans | Minimum
Debt Instrument [Line Items]
Consolidated leverage ratio	0.50%
Term Loan A | One Month Eurodollar Rate Plus Index Based Loans | Maximum
Debt Instrument [Line Items]
Consolidated leverage ratio	1.25%
Term Loan A | One Two Three Six Month Eurodollar Rate Plus Index Based Loans | Minimum
Debt Instrument [Line Items]
Consolidated leverage ratio	1.50%
Term Loan A | One Two Three Six Month Eurodollar Rate Plus Index Based Loans | Maximum
Debt Instrument [Line Items]
Consolidated leverage ratio	2.25%
Short Term on Demand Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility amount outstanding	500,000
Letter of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity	125,000,000
Accounts Receivable Securitization Facility
Debt Instrument [Line Items]
Accounts receivable securitization program, additional capacity	30,000,000
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
7.00% Senior Unsecured Notes
Debt Instrument [Line Items]
Reduction of long-term debt	250,000,000				250,000,000
Senior notes, interest rate	7.00%				7.00%
Debt instrument redemption, date	Jul. 31, 2014				Jul. 31, 2014
Unsecured notes make-whole redemption price					104.56%
Write-off deferred charges	20,000,000
Original issue discount on the extinguished debt	5,000,000
Write-off deferred charges, original issue discount and make-whole premiums paid	11,000,000				11,000,000
Senior notes, maturity date	Oct. 01, 2018
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
Credit Agreement And Securitization
Debt Instrument [Line Items]
Average amounts outstanding under Credit Agreement, Prior Credit Agreement, demand notes and accounts receivable securitization programs	2,400,000,000	2,900,000,000	2,900,000,000
Effective interest rate	1.80%	2.20%	2.90%
Maximum amounts outstanding at any month-end	2,650,000,000	3,000,000,000	3,060,000,000
Amendment of Credit Facility
Debt Instrument [Line Items]
Line of credit facility, starting date				Aug. 07, 2014
Line of credit facility, maturity month				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	$ 1,764,000,000
Amendment of Credit Facility | Accounts Receivable Securitization Facility
Debt Instrument [Line Items]
Line of credit facility, starting date						Aug. 01, 2014
Line of credit facility, maturity date						Oct. 31, 2016