Preferred Stock - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended		0 Months Ended	3 Months Ended
	Nov. 21, 2008	Dec. 31, 2013	Dec. 31, 2012	Aug. 22, 2012 Warrant [Member]	Dec. 31, 2012 Preferred Stock [Member]	Dec. 31, 2013 Preferred Stock [Member]
Partners Capital And Distributions [Line Items]
Preferred shares sold	52,000	28,000	28,000
Common stock purchased	679,443
Proceeds from preferred stock and warrant	$ 52,000,000
Fair value allocated to preferred stock	48,980,000
Fair value allocated to warrant	3,020,000
Cumulative dividends		5.00%
Cumulative dividends payment term		First five years
Cumulative dividends		9.00%
Redeemed price of preferred stock		$ 1,000
Repurchase of warrant			$ 2,670,000	$ 2,670,000
Repurchase of preferred stock					24,000
Preferred stock outstanding		28,000	28,000		28,000	28,000