Earnings Per Common Share - Historical Net Income and Weighted Average Number of Shares of Common Stock Outstanding (Detail) In Thousands, 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]
Weighted average number of shares of common stock outstanding	23,459	23,414	23,453	23,406
Shares assumed issued (less shares assumed purchased for treasury) for stock-based compensation	326	136	362	110
Outstanding shares for diluted earnings per share calculation	23,785	23,550	23,815	23,516