Debt - Additional Information 2 (Detail) (USD $)	3 Months Ended		9 Months Ended			1 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Apr. 24, 2013 Term Loan B [Member] 2012-2 Term Loan B [Member]	Sep. 30, 2013 Term Loan B [Member] 2012-2 Term Loan B [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 5,691,697,000		$ 5,691,697,000		$ 5,440,073,000		$ 300,000,000
Eurodollar Rate margin							2.75%
Base rate margin							1.75%
Base rate floor							2.00%
Eurodollar rate floor							1.00%
Accrued interest on Term Loan							3.75%
Percentage of par value price for issuance of term loan							99.75%
Financing fees							3,500,000
Term Loan, outstanding balance repaid							190,000,000
Prepayment of term loan						189,300,000
Deferred financing fees expense	3,981,000	3,199,000	11,508,000	9,293,000		2,000,000
Wrote off of discount related to debt						400,000
Term Loan, Principal balance							110,000,000
Remaining deferred financing fees, net							$ 1,100,000