Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Disclosure Income Taxes Additional Information [Abstract]
Total liability associated with unrecognized tax benefit	$ 100,000	$ 300,000
State net operating losses for state income tax	29,100,000
Deferred tax asset related to net operating loss carry-forwards	1,186,000	1,444,000
Deferred state income taxes	$ 2,600,000	$ 2,100,000	$ 1,900,000