Earnings per Common Share - Additional Information (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Dilutive shares related to convertible preferred stock	3,078,245	3,196,931	3,101,937	3,196,931
Unvested restricted shares of outstanding	16,983	0	16,983	0
Anti dilutive shares excluded from computation of earning price per share			$ 10.82
Number of stock option outstanding	0	0	0	0