Geographic Areas - Schedule of Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Products	$ 135,194	$ 187,524
Services	31,367	38,478
Revenues	166,561	226,002
Income before income taxes	49,821	71,739
Total Long-Lived Assets	305,842		$ 303,952
Total Assets	1,470,458		1,428,250
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	11,176	11,387
Consolidation, Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	11,176	11,387
Income before income taxes	2,068	3,658
Total Long-Lived Assets	2,926		2,926
Total Assets	18,671		13,705
Western Hemisphere [Member]
Segment Reporting Information [Line Items]
Products	78,600	91,815
Services	16,993	22,309
Western Hemisphere [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	106,304	124,109
Income before income taxes	24,956	32,948
Total Long-Lived Assets	212,069		208,408
Total Assets	710,691		677,460
Western Hemisphere [Member] \| Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	10,711	9,985
Eastern Hemisphere [Member]
Segment Reporting Information [Line Items]
Products	33,161	79,421
Services	13,004	11,642
Eastern Hemisphere [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	46,350	91,284
Income before income taxes	16,684	31,708
Total Long-Lived Assets	42,332		43,449
Total Assets	398,324		391,672
Eastern Hemisphere [Member] \| Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	185	221
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Products	23,433	16,288
Services	1,370	4,527
Asia Pacific [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	25,083	21,996
Income before income taxes	6,113	3,425
Total Long-Lived Assets	54,367		55,021
Total Assets	380,114		$ 372,823
Asia Pacific [Member] \| Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	$ 280	$ 1,181

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
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