Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Taxes And Tax Related [Line Items]
Provision (benefit) for income taxes	$ 739,000	$ (56,000)	$ 1,911,000	$ (374,000)
Unrecognized tax benefits	100,000		100,000
BMS [Member]
Income Taxes And Tax Related [Line Items]
Net effect on earnings related to deferred tax liabilities	$ 0		0
Net effect on cash flow related to deferred tax liabilities			0
Settlement expense			6,300,000
Payments made on behalf of the company to a number of states in connection with state income tax settlements			$ 1,900,000