Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified				1 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Feb. 28, 2014 Interest Rate Swaps Agreement	Oct. 31, 2013 Interest Rate Swaps Agreement
Derivative [Line Items]
Interest rate swap agreement, term				15 years	10 years
Notional amount	$ 13,707	$ 11,690	$ 9,072	$ 4,340	$ 3,500