Quarterly report pursuant to Section 13 or 15(d)

Noncontrolling Interests in Subsidiaries - Schedule of Noncontrolling Interests in the Company's Consolidated Subsidiaries (Details) (Parenthetical)

v3.19.1
Noncontrolling Interests in Subsidiaries - Schedule of Noncontrolling Interests in the Company's Consolidated Subsidiaries (Details) (Parenthetical)
Mar. 31, 2019
Dec. 31, 2018
Windcat Workboats Facilities    
Minority Interest [Line Items]    
Noncontrolling interest, percent 0.00% [1] 12.50%
[1] As of March 31, 2019; at December 31, 2018, noncontrolling interest was 12.5%.