Loss Per Share - Computation of Basic and Diluted Loss Per Share (Parenthetical) (Detail) - Redeemable Preferred Stock [Member]	9 Months Ended
	Mar. 31, 2018 $ / shares shares
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Preferred stock sold | shares	4,000
Preferred stock, par value | $ / shares	$ 5,000
Preferred stock dividend rate	9.50%
Call Option [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Preferred stock redemption period	5 years
Put Option [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Preferred stock redemption period	10 years