Goodwill - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Impairments	$ 38,600,000	$ 0	$ 38,559,000
Goodwill	7,714,000	7,947,000	7,714,000	$ 47,624,000
Western Hemisphere
Goodwill [Line Items]
Impairments			38,559,000
Goodwill	0		0	39,158,000
Eastern Hemisphere
Goodwill [Line Items]
Impairments			0
Goodwill	$ 7,714,000	$ 7,947,000	$ 7,714,000	$ 8,466,000
Percentage fair value in excess of carrying value	71.00%		71.00%

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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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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Percentage of fair value of reporting unit in excess of carrying amount.

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