Earnings Per Common Share (Additional Information) (Detail) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Decrease in income attributable to common shareholders	$ (200,000)	$ 0	$ 700,000	$ 500,000
Option to purchase common stock shares not included in the computation of diluted EPS (in shares)	0.5		0.6