Subsequent Events - Additional Information (Detail) - $ / shares	3 Months Ended
	Sep. 30, 2015	Jun. 30, 2014
Dividends Payable [Line Items]
Dividend declared, per share	$ 0.34	$ 0.34
Dividend Declared [Member]
Dividends Payable [Line Items]
Dividend declared, declaration date	Oct. 20, 2015
Dividend declared, payable date	Dec. 10, 2015
Dividend declared, record date	Nov. 20, 2015