Subsequent Events - Additional Information (Detail) (USD $)	6 Months Ended	1 Months Ended
	Jun. 30, 2014	Jul. 31, 2014 Subsequent Event
Subsequent Event [Line Items]
Cash collateral included in restricted cash	$ 8,600,000
Cash collateral call reducing restricted cash		8,500,000
Cash collateral call expects to recover through assets secured	8,500,000
Loss recognized on assets secured account		$ 0