Stockholders' Equity - Additional Information (Detail) (USD $)	1 Months Ended		3 Months Ended				6 Months Ended						3 Months Ended	6 Months Ended	12 Months Ended				1 Months Ended
	Jan. 30, 2013	Jan. 03, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Equity Plan [Member]	Jun. 30, 2013 Equity Plan [Member]	Dec. 31, 2012 Equity Plan [Member]	Jun. 30, 2013 Manager Equity Plan [Member]	Jun. 30, 2013 RSU [Member]	Jun. 30, 2013 RSU [Member]	Dec. 31, 2012 RSU [Member]	Dec. 31, 2011 RSU [Member]	Jun. 30, 2013 Minimum [Member]	Jun. 30, 2013 Maximum [Member]	Jan. 31, 2013 Restricted Stock Units (RSUs) [Member]
Shareholders Equity [Line Items]
Common stock issued			10,246,020		10,246,020		10,246,020
Common stock, par value			$ 0.001		$ 0.001		$ 0.001
Authorized preferred stock			100,000,000		100,000,000		100,000,000
Preferred stock, par value			$ 0.001		$ 0.001		$ 0.001
Authorized common stock			250,000,000		250,000,000		250,000,000
Common stock outstanding			10,226,250		10,226,250		10,226,250
Warrant to purchase shares			652,500		652,500	652,500	652,500	652,500				652,500
Common stock, conversion rate			11.33		11.33		11.33
Warrant expiration date							Sep. 30, 2018
Common shares remain available for future issuances			156,974				156,974			156,974	700,000	134,629
Cash dividends declared per common share			$ 0.155	$ 0.02	$ 0.135	$ 0.270	$ 0.155	$ 0.270
Common stock cash dividends, declared date				May 09, 2013	Mar. 21, 2013
Common stock cash dividends, paid date				Jun. 06, 2013	Apr. 18, 2013
Common stock cash dividends, record date				May 23, 2013	Apr. 04, 2013
Common stock issued to employees as part of RSU grants, shares		15,712
Common stock issued to employees as part of RSU grants, value		$ 117,840
Common stock repurchased by Company	302
Fair value of common stock repurchased by Company	$ 7.50
Issue of common stock									4,360
Aggregate fair value			30,000	30,000			30,000
Annual base retainer amount received			50,000				50,000
Percentage of annual base retainer amount paid in cash			70.00%				70.00%
Percentage of annual base retainer amount paid in shares			30.00%				30.00%
Restricted stock units, issued															33,600	100,153
Fair value, restricted stock units															300,000	700,000
Restricted stock units, fair value															7.50	6.50
Unvested RSU													2,000	12,000
Previously granted restricted stock units forfeited																			4,358
Participant earned performance			100.00%				100.00%										50.00%	200.00%
Unvested performance share awards outstanding			0				0
Total unrecognized compensation			$ 400,000				$ 400,000