Summary of Significant Accounting Policies - Details of Computation of Earnings Per Common Share, Basic and Diluted (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Numerator for basic per share calculation:
Income from continuing operations for basic calculation	$ 16,304,000	$ 705,000	$ 522,000	$ 402,000	$ 6,519,000	$ 860,000	$ 498,000	$ 136,000	$ 17,933,431	$ 8,013,330	$ 4,861,385
(Loss) from discontinued operations, net of income tax expense									(336,489)	(12,296,912)	(2,974,958)
Net income (loss) for basic calculation	16,214,000	649,000	484,000	250,000	7,066,000	666,000	2,193,000	(14,209,000)	17,596,942	(4,283,582)	1,886,427
Numerator for diluted per share calculation:
Income from continuing operations	16,304,000	705,000	522,000	402,000	6,519,000	860,000	498,000	136,000	17,933,431	8,013,330	4,861,385
Adjustments to income from continuing operations for the income statement impact of dilutive securities
Income from continuing operations for dilution calculation									17,933,431	8,013,330	4,861,385
(Loss) from discontinued operations, net of income tax expense									(336,489)	(12,296,912)	(2,974,958)
Net income (loss) for dilution calculation									$ 17,596,942	$ (4,283,582)	$ 1,886,427
Denominator:
Weighted average common shares - basic	10,909,000	10,908,000	10,892,000	10,828,000	10,728,000	10,703,000	10,686,000	10,624,000	10,884,533	10,685,333	10,569,805
Effect of dilutive securities:
RSUs									242,396	305,033	301,956
Stock options									269,630	43,716	5,115
Weighted average common shares - diluted	11,464,000	11,445,000	11,398,000	11,348,000	11,233,000	11,094,000	10,950,000	11,011,000	11,396,559	11,034,082	10,876,876
Per common share amounts - basic:
Income from continuing operations	$ 1.49	$ 0.06	$ 0.05	$ 0.04	$ 0.61	$ 0.08	$ 0.05	$ 0.01	$ 1.65	$ 0.75	$ 0.46
(Loss) from discontinued operations									$ (0.03)	$ (1.15)	$ (0.28)
Net income (loss)	$ 1.49	$ 0.06	$ 0.04	$ 0.02	$ 0.66	$ 0.06	$ 0.21	$ (1.34)	$ 1.62	$ (0.40)	$ 0.18
Per common share amounts - diluted:
Income from continuing operations	$ 1.42	$ 0.05	$ 0.05	$ 0.04	$ 0.58	$ 0.08	$ 0.05	$ 0.01	$ 1.57	$ 0.73	$ 0.45
(Loss) from discontinued operations									$ (0.03)	$ (1.12)	$ (0.28)
Net income (loss)	$ 1.41	$ 0.05	$ 0.04	$ 0.02	$ 0.63	$ 0.06	$ 0.20	$ (1.29)	$ 1.54	$ (0.39)	$ 0.17