Other Liabilities - Components of Other Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Other Liabilities Disclosure [Abstract]
Deferred compensation	$ 6,718	$ 7,357
Pension liability	15,278	14,634
Joint beneficiary agreements	2,812	2,623
Miscellaneous other liabilities	8,523	7,097
Total other liabilities	$ 33,331	$ 31,711