Components of Interest Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Banking and Thrift [Abstract]
Interest on borrowings and related fees	$ 13,583	$ 14,017
Accretion of original issue discount	321	333
Amortization of debt issuance costs	626	682
Capitalized interest	(51)	(258)
Interest expense	$ 14,479	$ 14,774