Share Repurchase Programs (Detail) - USD ($)	3 Months Ended		6 Months Ended	77 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2020	Aug. 31, 2014
Equity [Abstract]
Stock repurchase program, authorized amount					$ 50,000,000
Purchase of common stock, shares (in shares)	0			1,416,587
Common stock repurchased		$ 1,625,000	$ 1,625,000	$ 22,300,000