Earnings per Common Share - Additional Information (Detail) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Dilutive shares related to convertible preferred stock	3,079,665	3,196,931	3,113,980	3,196,931
Nonvested 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
Dilutive shares related to restricted stock	92