Quarterly report pursuant to Section 13 or 15(d)

Subsequent Event (Detail)

v3.10.0.1
Subsequent Event (Detail) - Water and Gas Pipeline Infrastructure Contractor - Subsequent Event
$ in Millions
Aug. 07, 2018
USD ($)
Subsequent Event [Line Items]  
Cost method investment, ownership percentage 30.00%
Cost method investment, original cost $ 22.2
Cost method investment, deposits paid $ 3.7