Treasury Stock and Subsequent Event - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended			1 Months Ended			9 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2013	Jan. 21, 2014 Subsequent Event [Member]	Aug. 31, 2013 Minimum [Member]	Aug. 31, 2013 Maximum [Member]	Dec. 31, 2013 Common Class A [Member]
Class of Stock [Line Items]
Number of shares authorized to repurchase							2,000,000	34,000,000
Treasury stock, value	$ 325,276,000		$ 325,276,000		$ 301,301,000
Treasury stock, shares	32,080,182		32,080,182		31,317,014
Common stock equals to percentage of outstanding common stock			61.00%
Average price						$ 47.85			$ 10.14
Common stock repurchased shares	105,553		763,168
Purchase of treasury stock	4,200,000		23,975,000	23,676,000
Common stock outstanding	20,936,089		20,936,089		21,520,248
Common stock repurchased shares						17,754
Purchase of treasury stock						$ 850,000
Stock split ratio		2
Stock dividend percentage		100.00%
Stock dividend distribution date		Jun. 26, 2013
Stock dividend recording date		Jun. 12, 2013