Geographic Areas - Schedule of Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Products	$ 101,277	$ 157,790	$ 352,519	$ 521,413
Services	22,363	43,612	80,121	121,267
Revenues	123,640	201,402	432,640	642,680
Income before income taxes	23,877	64,596	119,446	189,076
Total Long-Lived Assets	304,008		304,008		$ 303,952
Total Assets	1,462,060		1,462,060		1,428,250
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	7,888	20,043	29,827	52,010
Consolidation, Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(7,888)	(20,043)	(29,827)	(52,010)
Income before income taxes	(1,220)	203	2,401	6,647
Total Long-Lived Assets	(478)		(478)		(2,926)
Total Assets	(15,686)		(15,686)		(13,705)
Western Hemisphere [Member]
Segment Reporting Information [Line Items]
Products	61,071	75,681	202,457	250,056
Services	13,395	23,285	47,171	67,092
Western Hemisphere [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	80,910	115,968	277,288	358,905
Income before income taxes	9,406	23,536	48,397	83,500
Total Long-Lived Assets	213,603		213,603		208,408
Total Assets	716,829		716,829		677,460
Western Hemisphere [Member] | Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	6,444	17,002	27,660	41,757
Eastern Hemisphere [Member]
Segment Reporting Information [Line Items]
Products	26,133	44,955	89,207	185,194
Services	7,264	15,128	28,275	40,387
Eastern Hemisphere [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	33,506	60,632	117,798	230,953
Income before income taxes	15,618	24,386	57,352	69,969
Total Long-Lived Assets	36,137		36,137		43,449
Total Assets	391,815		391,815		391,672
Eastern Hemisphere [Member] | Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	109	549	316	5,372
Asia-Pacific [Member]
Segment Reporting Information [Line Items]
Products	14,073	37,154	60,855	86,163
Services	1,704	5,199	4,675	13,788
Asia-Pacific [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	17,112	44,845	67,381	104,832
Income before income taxes	73	16,471	11,296	28,960
Total Long-Lived Assets	54,746		54,746		55,021
Total Assets	369,102		369,102		$ 372,823
Asia-Pacific [Member] | Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	$ 1,335	$ 2,492	$ 1,851	$ 4,881