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Segment Information, Geographical Data and Major Customers (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 116,368		$ 122,149
Operating profit (loss)	(3,615)		4,310
Corporate expenses	(10,042)		(15,200)
Long-lived asset impairments	(10,207)	$ (26,700)
Gain on asset dispositions, net	5,331		1,270
Operating loss	(18,533)		(9,620)
Depreciation and amortization	27,107		22,932
Additions to properties and equipment	2,449		3,116
All Other Segments
Segment Reporting Information [Line Items]
Operating profit (loss)	1,721		1,704
Operating Segments | Americas
Segment Reporting Information [Line Items]
Operating profit (loss)	(1,164)		(1,030)
Depreciation and amortization	7,496		6,261
Additions to properties and equipment			398
Operating Segments | Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Operating profit (loss)	(856)		(1,162)
Depreciation and amortization	5,527		4,450
Additions to properties and equipment	680		1,459
Operating Segments | Europe/Mediterranean
Segment Reporting Information [Line Items]
Operating profit (loss)	1,547		(3,317)
Depreciation and amortization	6,819		7,446
Additions to properties and equipment	440		121
Operating Segments | West Africa Segment
Segment Reporting Information [Line Items]
Operating profit (loss)	(4,863)		8,115
Depreciation and amortization	6,404		4,444
Additions to properties and equipment	751		243
Corporate
Segment Reporting Information [Line Items]
Depreciation and amortization	861		331
Additions to properties and equipment	578		895
Service | Operating Segments | Americas
Segment Reporting Information [Line Items]
Total revenues	31,859		35,279
Service | Operating Segments | Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Total revenues	24,828		20,456
Service | Operating Segments | Europe/Mediterranean
Segment Reporting Information [Line Items]
Total revenues	29,491		28,558
Service | Operating Segments | West Africa Segment
Segment Reporting Information [Line Items]
Total revenues	25,796		35,369
Other Operating Revenues
Segment Reporting Information [Line Items]
Total revenues	$ 4,394		$ 2,487

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