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Asset Dispositions, Asset Held for Sale and Asset Impairments - Additional Information (Detail) $ in Thousands	3 Months Ended					6 Months Ended
	Jun. 30, 2020 USD ($) Vessel	Mar. 31, 2020 USD ($) Vessel	Dec. 31, 2019 Vessel	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2020 USD ($) Vessel	Jun. 30, 2019 USD ($)
Long Term Purchase Commitment [Line Items]
Number Of vessels held for sale						46
Number of vessels sold	14	8				22
Long-lived asset impairments | $	$ 55,482			$ 494		$ 65,689	$ (776)
Percentage reduction in the value of vessels						10.00%
Active Vessels
Long Term Purchase Commitment [Line Items]
Number Of vessels held for sale			46			22
Number of additional vessels sold						22
Number of vessels sold		8				14
Number of revalued vessels sold					38	24
Long-lived asset impairments | $					$ 10,200	$ 5,600
Impairment expense | $						$ 49,900
Stacked and Active Vessels
Long Term Purchase Commitment [Line Items]
Number Of vessels held for sale						22
Number of vessels sold						25
Number Of Vessels Active	3					3
Gains on the asset sales | $	$ 1,700	$ 5,300				$ 7,000

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