Income Taxes - Income Tax Provision (Detail) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Current:
Federal	$ 17,400	$ 18,506	$ 50,501	$ (48,967)
State	55,762	7,296	56,575	8,109
Total	73,162	25,802	107,076	(40,858)
Deferred:
Federal	880,363	792,138	1,006,149	868,764
State	158,293	140,206	261,648	234,815
Total	1,038,656	932,344	1,267,797	1,103,579
Income tax (expense) benefit	$ 1,111,818	$ 958,146	$ 1,374,873	$ 1,062,721

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.