Geographic Areas - Schedule of Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Products	$ 91,592	$ 135,194
Services	27,636	31,367
Revenues	119,228	166,561
Depreciation and amortization	9,832	7,775
Income before income taxes	52	49,821
Total Long-Lived Assets	446,258		$ 404,693
Total Assets	1,453,487		1,461,404
Intercompany [Member]
Segment Reporting Information [Line Items]
Revenues	6,000	11,176
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(6,000)	(11,176)
Income before income taxes	90	2,068
Total Long-Lived Assets	(479)		(480)
Total Assets	(11,444)		(2,526)
Western Hemisphere [Member]
Segment Reporting Information [Line Items]
Products	65,288	78,600
Services	18,462	16,993
Western Hemisphere [Member] \| Intercompany [Member]
Segment Reporting Information [Line Items]
Revenues	5,903	10,711
Western Hemisphere [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	89,653	106,304
Depreciation and amortization	7,735	5,248
Income before income taxes	(5,373)	24,956
Total Long-Lived Assets	359,705		317,875
Total Assets	760,297		775,358
Eastern Hemisphere [Member]
Segment Reporting Information [Line Items]
Products	13,926	33,161
Services	6,275	13,004
Eastern Hemisphere [Member] \| Intercompany [Member]
Segment Reporting Information [Line Items]
Revenues	31	185
Eastern Hemisphere [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	20,232	46,350
Depreciation and amortization	1,080	1,323
Income before income taxes	3,491	16,684
Total Long-Lived Assets	33,698		33,338
Total Assets	328,131		318,529
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Products	12,378	23,433
Services	2,899	1,370
Asia Pacific [Member] \| Intercompany [Member]
Segment Reporting Information [Line Items]
Revenues	66	280
Asia Pacific [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	15,343	25,083
Depreciation and amortization	1,017	1,204
Income before income taxes	1,844	$ 6,113
Total Long-Lived Assets	53,334		53,960
Total Assets	$ 376,503		$ 370,043

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.18)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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