Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Goodwill And Other Intangible Assets [Line Items]
Other intangible assets, net	$ 4,517,000	$ 4,993,000
Accumulated amortization of intangible assets	25,700,000	25,200,000
Estimated remaining amortization expense, 2014	158,000
Estimated remaining amortization expense, 2015	634,000
Estimated remaining amortization expense, 2016	457,000
Estimated remaining amortization expense, 2017	209,000
Estimated remaining amortization expense, 2018	209,000
Customer Relationships, Customer Contracts, and Other [Member]
Goodwill And Other Intangible Assets [Line Items]
Other intangible assets, net	2,300,000	2,800,000
Trade Names and Trademarks [Member]
Goodwill And Other Intangible Assets [Line Items]
Other intangible assets, net	$ 2,200,000	$ 2,200,000