Employee Benefit Plans - Change in Benefit Obligation (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Pension Plan, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation, beginning of year	$ 2,854,443	$ 3,948,661
Service cost		254,285
Interest cost	143,259	178,298
Actuarial (gain) loss	225,315	319,817
Benefit payments	(478,454)	(2,017,995)
Settlement (gain) loss	(7,278)	171,377
Benefit obligation, end of year	2,737,285	2,854,443
Other Postretirement Benefit Plan, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation, beginning of year	759,503	676,618
Service cost	22,950	26,002
Interest cost	29,906	29,957
Actuarial (gain) loss	(190,153)	42,235
Benefit payments	(15,061)	(15,309)
Benefit obligation, end of year	$ 607,145	$ 759,503