Employee Benefit Plans - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013 Age
Defined Benefit Plan Disclosure [Line Items]
Minimum age of full-time employees	21
Conditional age-1 for availing plan	55
Conditional age-2 for availing plan	65
Conditional years of service -1 for availing plan	10 years
Conditional years of service-2 for availing plan	5 years
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future benefit payments in 2013	$ 0
Post Retirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated future benefit payments in 2013	23,945
Employer contributions	$ 7,984