Debt - Additional Information (Detail) (USD $)		1 Months Ended		1 Months Ended	3 Months Ended	1 Months Ended	2 Months Ended	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2012 Secured Debt	Jul. 31, 2012 Secured Debt Repayment of Debt	Jun. 30, 2012 LIBOR Plus A Margin Of 138 Basis Points	Mar. 31, 2012 LIBOR Plus A Margin Of 138 Basis Points	Jul. 31, 2012 LIBOR Plus A Margin Of 138 Basis Points Repayment of Debt	Jul. 31, 2012 LIBOR Plus A Margin Of 138 Basis Points Repayment of Debt Installment	Mar. 31, 2012 LIBOR Plus A Margin Of 175 Basis Points
Debt Disclosure [Line Items]
Term loan					$ 1,200,000,000			$ 200,000,000
Base points margin		0.70%			1.38%			1.75%
Term loan issued, number of payments							2
Term loan issued, payments made				400,000,000		400,000,000
Receivable securitization facility, borrowed amount		225,000,000
Receivable securitization facility, interest rate		0.224%
Receivable securitization facility, repaid date			2012-07
Debt and capital lease obligations	11,300,000,000
Debt fair value	$ 13,000,000,000