Senior Notes Payable - Additional Information (Detail) (USD $)	7 Months Ended	9 Months Ended			0 Months Ended			0 Months Ended
	Jul. 31, 2014	Sep. 30, 2014	Dec. 31, 2013	Aug. 31, 2012	Jul. 31, 2014 Securities Repurchase Plan [Member]	Sep. 30, 2014 Securities Repurchase Plan [Member]	Jul. 31, 2014 Securities Repurchase Plan [Member]	Oct. 30, 2014 Securities Repurchase Plan [Member] Subsequent Event [Member]	Oct. 30, 2014 Securities Repurchase Plan [Member] Subsequent Event [Member]
Debt Instrument [Line Items]
Senior notes payable			$ 86,250,000	$ 86,250,000
Senior notes issue price				100.00%
Maturity period of the assumed debt		Aug. 15, 2022
Notes interest rate		7.75%
Redemption price of notes		100.00%
Outstanding Notes acquired			1,742,000			75,072,000	11,178,000		557,000
Aggregate price of outstanding Notes					11,742,000			583,000
Loss on extinguishment of debt	$ (564,000)				$ 564,000