Significant Accounting Policies - Additional Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Accounting Policies [Abstract]
Cash paid for interest	$ 17,681	$ 22,913
Cash paid for income tax	42,944	38,761
Loans foreclosed and transferred to other real estate owned and foreclosed assets	3,251	5,336
Loans to facilitate the sale of other real estate owned	228	0
Deferred gain on sale of building and parking garage	$ 922	$ 0