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Earnings Per Share - Computation for Earnings Per Share (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net Income	$ 9,279,879	$ 9,512,622
Less: Net income attributable to redeemable noncontrolling interest	(14,216)	0
Net Income	$ 9,265,663	$ 9,512,622
Weighted average shares outstanding
Basic (in shares)	3,388,743	3,218,154
Dilutive impact of restricted stock grants with forfeitable rights to dividends (in shares)	0	74,076
Dilutive impact of restricted stock units (in shares)	4,653	3,938
Diluted (in shares)	3,393,396	3,296,168
Earnings per share
Basic (USD per share)	$ 2.73	$ 2.96
Diluted (USD per share)	$ 2.73	$ 2.89

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