Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Goodwill [Line Items]
Goodwill and intangible assets with indefinite lives	$ 66,989,000		$ 68,697,000
Amortization expense associated with identifiable intangible assets	1,700,000	1,500,000
Estimated total amortization expense 2014	2,300,000
Estimated total amortization expense 2015	2,300,000
Estimated total amortization expense 2016	700,000
Estimated total amortization expense 2017	400,000
Estimated total amortization expense 2018	400,000
Indefinite-lived Intangible Assets
Goodwill [Line Items]
Goodwill and intangible assets with indefinite lives	$ 59,700,000		$ 59,700,000