Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment charges of cumulative goodwill	$ 54,600,000
Other net intangibles	480,000	956,000
Weighted average amortization period of intangible assets	6 months	1 year 6 months	2 years 6 months
Amortization expense of intangible assets	302,000	738,000	1,100,000
Amortization from capitalized software development costs	$ 214,000	$ 327,000	$ 156,000