Earnings (Loss) 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
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Weighted average number of shares of common stock outstanding	23,397	25,420
Shares assumed issued (less shares assumed purchased for treasury) for stock-based compensation		216
Outstanding shares for diluted earnings (loss) per share calculation	23,397	25,636