Summary of Vessels Impaired and Amount of Impairment Incurred (Detail) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018 USD ($) Vessel	Jun. 30, 2017 USD ($) Vessel	Jun. 30, 2018 USD ($) Vessel	Jun. 30, 2017 USD ($) Vessel
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]
Number of vessels impaired in the period | Vessel	[1]	2		15
Amount of impairment incurred | $	[2]	$ 1,215		$ 7,401
Predecessor
Schedule of Vessels Impaired and Amount of Impairment Incurred [Line Items]
Number of vessels impaired in the period | Vessel	[1]		77		89
Amount of impairment incurred | $	[2]		$ 163,423		$ 228,280

[1] For the quarter and six months periods ended June 30, 2018, there were 2 and 15 stacked vessels impaired, respectively. For the quarter ended June 30, 2017, there were 72 stacked vessels and 5 active vessels impaired, respectively and for the six month period ended June 30, 2017 there were 83 stacked vessels and 6 active vessels impaired, respectively.

[2] Refer to Note (14) for additional information regarding asset impairment.