Post-Retirement Benefit Plans Other than Pensions - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Post retirement benefit plans other than pensions, life insurance plan, coverage value maximum	$ 5,000
Accrued post-retirement benefit cost	156,881	186,695
Deferred compensation plan interest Rate	3.00%	3.00%	6.00%
Deferred Compensation	382,599	828,998
Deferred compensation earnings allocated to the deferred compensation	$ 13,859	$ 40,575	$ 91,552
Post-Retirement Life Benefit Programs [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Post retirement benefit plans other than pensions, supplemental benefits, age	55 years
Post retirement benefit plans other than pensions, supplemental benefits, years of service	20 years
Post-Retirement Supplemental Medicare Benefits Programs [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Post retirement benefit plans other than pensions, supplemental benefits, age	65 years
Post retirement benefit plans other than pensions, supplemental benefits, years of service	20 years