Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill And Intangible Assets Disclosure [Abstract]
Subsequent impairment of the underlying assets	$ 0
Amortization expense	800,000	800,000	800,000
Expected annual amortization expense for 2014	800,000
Expected annual amortization expense for 2015	800,000
Expected annual amortization expense for 2016	800,000
Expected annual amortization expense for 2017	800,000
Expected annual amortization expense for 2018	800,000
Thereafter	$ 800,000