Subsequent Events - Summary of Company's Initial Public Offerings (Footnote Information) (Detail) - Minimum - USD ($)	Aug. 02, 2017	Jun. 30, 2017
Ohio
Subsidiary, Sale of Stock [Line Items]
Minimum common stock subscription value		$ 7,000,000
Pennsylvania
Subsidiary, Sale of Stock [Line Items]
Minimum common stock subscription value		75,000,000
Washington
Subsidiary, Sale of Stock [Line Items]
Minimum common stock subscription value		$ 10,000,000
Subsequent Event | Ohio
Subsidiary, Sale of Stock [Line Items]
Minimum common stock subscription value	$ 7,000,000
Subsequent Event | Pennsylvania
Subsidiary, Sale of Stock [Line Items]
Minimum common stock subscription value	75,000,000
Subsequent Event | Washington
Subsidiary, Sale of Stock [Line Items]
Minimum common stock subscription value	$ 10,000,000