Earnings per Common Share - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013 Stock Options [Member]	Sep. 30, 2013 Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, amount	0	0	10,000	10,000
Exercise price of stock options not considered in computing diluted earnings per common share			$ 35.00	$ 35.00
Dilutive shares related to convertible preferred stock	3,196,931	3,196,931