Debt - Additional Information (Detail) (USD $)	3 Months Ended				6 Months Ended				1 Months Ended		1 Months Ended		12 Months Ended	1 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012		Feb. 29, 2012 LIBOR Plus A Margin Of 138 Basis Points	Jun. 30, 2012 LIBOR Plus A Margin Of 138 Basis Points	Feb. 29, 2012 LIBOR Plus A Margin Of 175 Basis Points	Jun. 30, 2012 LIBOR Plus A Margin Of 175 Basis Points	Dec. 31, 2012 One Point Three Eight Percentage Variable Rate Term Loan [Member]	Aug. 20, 2013 Repayment of Debt [Member] Subsequent Event [Member]	Jul. 29, 2013 Repayment of Debt [Member] Subsequent Event [Member]
Debt Disclosure [Line Items]
Term loan									$ 1,200,000,000		$ 200,000,000
Maturity date									Dec. 31, 2017		Dec. 31, 2017			Jun. 15, 2014
Pre-tax early debt extinguishment costs	3,000,000	[1]	10,000,000	[1]	9,000,000	[1]	26,000,000	[1]						17,000,000
Base points margin										1.38%		1.75%
Debt Instrument, repayments													1,200,000,000	300,000,000	98,000,000
Debt Instrument, Interest Rate, Stated Percentage														7.40%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	5.20%		1.625%		5.20%		1.625%								5.45%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum	7.95%		7.95%		7.95%		7.95%								6.45%
Debt and capital lease obligations	10,124,000,000				10,124,000,000
Debt fair value	$ 11,500,000,000				$ 11,500,000,000
Original maturity date range, minimum	2018		2017		2014		2012								2022
Original maturity date range, maximum	2027		2018		2027		2018								2033

[1] Amounts are included in Restructuring and Other Charges in the accompanying consolidated statements of operations.