Treasury Stock - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended			3 Months Ended
	Jun. 30, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Jun. 12, 2014 Subsequent Event [Member]	Aug. 31, 2013 Minimum [Member]	Aug. 31, 2013 Maximum [Member]
Class of Stock [Line Items]
Number of shares authorized to repurchase						2,000,000	34,000,000
Common stock repurchased shares		830,460	1,410,812	923,876	87,647
Purchase of treasury stock		$ 27,179,000	$ 30,727,000	$ 21,643,000	$ 4,100,000
Average price		$ 32.73	$ 21.78	$ 23.43	$ 47.05
Stock split ratio	2
Stock dividend percentage	100.00%
Stock dividend distribution date	Jun. 26, 2013
Stock dividend recording date	Jun. 12, 2013