Equity - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended
	May 03, 2019	Feb. 28, 2019	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	May 31, 2013
Class of Stock [Line Items]
Cash dividends declared per share of common stock			$ 0.10	$ 0.10	$ 0.20	$ 0.20
Cash dividends per common share, date of dividend payable		Apr. 17, 2019
Cash dividends per common share, date of record for dividend		Mar. 13, 2019
Class A Common Stock [Member]
Class of Stock [Line Items]
Aggregate amount of shares authorized to be repurchased							$ 500,000,000
Number of shares repurchased					0
Cash dividends declared per share of common stock		$ 0.10
Class A Common Stock [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Number of shares repurchased	5,200,000
Remaining authorized amount under stock repurchase program	$ 429,000,000
Aggregate cost of shares repurchased	$ 71,000,000
Class B Common Stock [Member]
Class of Stock [Line Items]
Cash dividends declared per share of common stock		$ 0.10