Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Goodwill - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
Goodwill - Additional Information (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill impairment loss	$ 7,700,000	$ 7,700,000	$ 0	$ 38,600,000
Goodwill			7,947,000	7,714,000
Eastern Hemisphere
Goodwill [Line Items]
Goodwill impairment loss	$ 7,700,000	$ 7,700,000
Goodwill			$ 7,947,000	$ 7,714,000
Percentage fair value in excess of carrying value				71.00%
Western Hemisphere
Goodwill [Line Items]
Goodwill impairment loss				$ 38,600,000
Goodwill				$ 0