Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended
	Jun. 30, 2016	Apr. 30, 2016	Jan. 31, 2016
Subsequent Event [Line Items]
Stock issued during period		0	0
Preferred stock, par value		$ 1	$ 1
Series A Preferred Stock [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Stock issued during period	320,000
Preferred stock dividend rate	9.00%
Preferred stock, par value	$ 1.00
Underwriters option exercise period	30 days
Additional shares granted to underwriters	48,000
Net proceeds from offering	$ 7.0