Earnings Per Share ("EPS") - Additional Information (Detail) (Class A Common Stock [Member])	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Class A Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Percentage of dividends paid			200.00%
Dilutive effect of stock options, increment in shares	795	476	1,162	686