Stockholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended			0 Months Ended	22 Months Ended	3 Months Ended	22 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Apr. 30, 2014 Subsequent Event [Member]	Mar. 31, 2014 Non-executive directors [Member] Restricted Stock [Member]	Mar. 31, 2014 2011 LTIP [Member] Restricted Stock Units [Member]	Mar. 31, 2014 2011 LTIP [Member] Restricted Stock Units [Member]	Dec. 31, 2013 2011 LTIP [Member] Restricted Stock Units [Member]	Mar. 31, 2013 2011 LTIP [Member] Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortization of stock based compensation	$ 1,086,000	$ 626,000
Common stock authorized	75,000,000
Common stock par value	$ 0.0001
Preferred stock authorized	25,000,000
Preferred stock par value	$ 0.0001
Common stock outstanding	21,658,816		21,652,341
Preferred stock outstanding	0		0
Restricted stock units awarded to CEO					36,756	0	557,484
Restricted stock unit forfeitures					3,189	0	152,044
Outstanding restricted stock units						617,027	617,027	617,027	504,600
Dividends declared				2,700,000
Dividend rate				$ 0.125
Declaration date				Apr. 30, 2014
Record Date				May 22, 2014
Payment Date				Jun. 25, 2014
Increase in additional paid-in capital	1,100,000
Additional paid-in capital	$ 128,364,000		$ 127,264,000