Earnings Per Share - Additional Information (Detail) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Antidilutive shares excluded from the diluted earnings per share calculations	37,500	75,500	37,500	75,500