Summary of Restricted Stock Activity (Detail) (USD $)	3 Months Ended
	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Outstanding, Nonvested beginning balance	1,058,443
Restricted Stock Outstanding, Shares Granted	399,860
Restricted Stock Outstanding, Shares Vested	(269,543)
Restricted Stock Outstanding, Shares Cancelled	(23,986)
Restricted Stock Outstanding, Nonvested ending balance	1,164,774
Weighted Average Grant Date Fair Value, Nonvested beginning balance	$ 27.03
Weighted Average Grant Date Fair Value, Shares Granted	$ 28.32
Weighted Average Grant Date Fair Value, Shares Vested	$ 31.07
Weighted Average Grant Date Fair Value, Shares Cancelled	$ 27.89
Weighted Average Grant Date Fair Value, Nonvested ending balance	$ 26.52