QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)

12 Months Ended

Dec. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

Selected financial information for interim periods, is as follows:

	Successor
	Quarter Ended			Quarter Ended			Quarter Ended			Quarter Ended
	March 31,			June 30,			September 30,			December 31,
(In thousands except per share data)	2018			2018			2018			2018
Year Ended December 31, 2018
Revenues	$	91,493			105,601			99,192			110,234
Impairment of due from affiliate included in operating loss		—			—			—			(20,083	)
Asset impairments included in operating loss		(6,186	)		(1,215	)		(16,853	)		(36,878	)
Operating income (loss)		(12,194	)		(140	)		(25,086	)		(70,077	)
Net loss attributable to Tidewater Inc.		(39,172	)		(10,940	)		(30,896	)		(90,509	)
Basic loss per share attributable to Tidewater Inc.	$	(1.67	)		(.44	)		(1.16	)		(2.83	)
Diluted loss per share attributable to Tidewater Inc.	$	(1.67	)		(.44	)		(1.16	)		(2.83	)
	Successor						Predecessor
				Period from			Period from
	Quarter Ended			August 1, 2017			July 1, 2017			Quarter Ended
	December 31,			through			through			June 30,
(In thousands except per share data)	2017			September 30, 2017			July 31, 2017			2017
Nine Month Transition Period Ended December 31, 2017
Revenues	$	104,453			74,300			36,263			115,106
Asset impairments included in operating loss		(16,777	)		—			(21,325	)		(163,423	)
Operating income (loss)		(18,091	)		(5,782	)		(38,674	)		(205,374	)
Net loss attributable to Tidewater Inc.		(23,573	)		(15,693	)		(1,122,475	)		(524,434	)
Basic loss per share attributable to Tidewater Inc.	$	(1.02	)		(.81	)		(23.82	)		(11.13	)
Diluted loss per share attributable to Tidewater Inc.	$	(1.02	)		(.81	)		(23.82	)		(11.13	)