Derivative Instruments - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Oct. 31, 2008
Debt Disclosure [Abstract]
Hedging gains or losses, fair value	$ 0	$ 0
Duration of interest rate swap agreement	7 years
Interest rate swap amount			10,000,000
Fixed rate of interest rate swap agreement to be paid	7.27%
Interest rate to be received under swap agreement	Three-month London Interbank Lending Rate (LIBOR) plus 3.10%
LIBOR	3.10%
Cost of termination of cash flow hedge	$ 585,000	$ 750,000