Borrowing Arrangements - Outstanding Borrowing (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule Of Borrowings [Line Items]
Outstanding borrowings	$ 784,075	$ 928,284
Deferred financing costs and original issue discount	(18,631)	(21,641)
Total debt	765,444	906,643
Less current maturities	7,900	2,036
Long-term debt	757,544	904,607
Term Loan [Member]
Schedule Of Borrowings [Line Items]
Outstanding borrowings	784,075
Tranche B and Series C New Term Loans [Member]
Schedule Of Borrowings [Line Items]
Outstanding borrowings		430,474
Senior Subordinated Notes [Member]
Schedule Of Borrowings [Line Items]
Outstanding borrowings		300,000
Senior Notes [Member]
Schedule Of Borrowings [Line Items]
Outstanding borrowings		$ 197,810