Minimum Rental Payments Required under Noncancelable Operating Leases (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Operating Leases [Line Items]
Operating Leases, Rent Expense, Net	$ 25,800	$ 27,400	$ 27,500
Operating Leases, Future Minimum Payments Due, Next Twelve Months	18,934
Operating Leases, Future Minimum Payments, Due in Two Years	15,968
Operating Leases, Future Minimum Payments, Due in Three Years	12,084
Operating Leases, Future Minimum Payments, Due in Four Years	9,216
Operating Leases, Future Minimum Payments, Due in Five Years	7,139
Operating Leases, Future Minimum Payments, Due Thereafter	21,418
Operating Leases, Future Minimum Payments Due, Total	$ 84,759