Excess Reorganization Value, Goodwill and Other Intangibles - Additional Information (Detail) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	$ 441,000			$ 441,000
Finite-lived intangible assets	2,504,000			$ 2,504,000
Weighted average life of finite-lived intangible assets				3 years
Finite-lived intangible assets, accumulated amortization	6,274,000			$ 6,274,000
Amortization expense	$ 346,000		$ 346,000	$ 1,037,000	$ 1,037,000
Impairment of excess reorganization value and goodwill		$ 0