Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions		1 Months Ended	9 Months Ended
	Nov. 01, 2019	Feb. 29, 2020	Mar. 31, 2020	Mar. 31, 2019	May 31, 2013
Class of Stock [Line Items]
Cash dividends per common share, date of dividend payable		Apr. 15, 2020
Cash dividends per common share, date of record for dividend		Mar. 11, 2020
Class A Common Stock [Member]
Class of Stock [Line Items]
Number of shares repurchased	5.2
Remaining authorized amount under stock repurchase program	$ 429,000,000
Aggregate amount of shares authorized to be repurchased					$ 500,000,000
Aggregate cost of shares repurchased	$ 71,000,000
Shares Repurchased During period			0.0	0.0
Cash dividends declared per share of common stock		$ 0.10
Class B Common Stock [Member]
Class of Stock [Line Items]
Shares Repurchased During period			0.0	0.0
Cash dividends declared per share of common stock		$ 0.10