Components of Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Banking and Thrift [Abstract]
Interest on borrowings and related fees	$ 23,324	$ 23,778	$ 46,132	$ 46,918
Amortization of debt issuance costs	1,176	1,039	2,280	2,051
Capitalized interest	(1,477)	(1,588)	(3,376)	(3,206)
Interest expense	$ 23,023	$ 23,229	$ 45,036	$ 45,763