Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill And Intangible Assets Disclosure [Abstract]
Impairment charges of cumulative goodwill	$ 54,600,000
Other net intangibles	956,000,000	1,200,000
Weighted average amortization period of intangible assets	1 year 6 months 0 days	2 years 6 months 0 days	3 years
Amortization expense of intangible assets		738,000,000	1,100,000	2,000,000
Amortization from capitalized software development costs	$ 327,000	$ 156,000	$ 39,000