Components of Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Banking and Thrift [Abstract]
Interest on borrowings and related fees	$ 23,239	$ 22,559	$ 69,371	$ 69,477
Amortization of debt issuance costs	1,224	1,063	3,504	3,114
Capitalized interest	(1,478)	(1,669)	(4,854)	(4,875)
Interest expense	$ 22,985	$ 21,953	$ 68,021	$ 67,716