Geographic Areas - Schedule of Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Products	$ 116,048	$ 176,099	$ 251,242	$ 363,623
Services	26,391	39,177	57,758	77,655
Revenues	142,439	215,276	309,000	441,278
Income before income taxes	45,748	52,741	95,569	124,480
Total Long-Lived Assets	307,259		307,259		$ 303,952
Total Assets	1,447,850		1,447,850		1,428,250
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	10,763	20,580	21,939	31,967
Consolidation, Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(10,763)	(20,580)	(21,939)	(31,967)
Income before income taxes	1,553	2,786	3,621	6,444
Total Long-Lived Assets	(2,927)		(2,927)		(2,926)
Total Assets	(22,257)		(22,257)		(13,705)
Western Hemisphere [Member]
Segment Reporting Information [Line Items]
Products	62,786	82,560	141,386	174,375
Services	16,783	21,498	33,776	43,807
Western Hemisphere [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	90,074	118,828	196,378	242,937
Income before income taxes	14,035	27,016	38,991	59,964
Total Long-Lived Assets	217,575		217,575		208,408
Total Assets	691,665		691,665		677,460
Western Hemisphere [Member] | Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	10,505	14,770	21,216	24,755
Eastern Hemisphere [Member]
Segment Reporting Information [Line Items]
Products	29,913	60,818	63,074	140,239
Services	8,007	13,617	21,011	25,259
Eastern Hemisphere [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	37,942	79,037	84,292	170,321
Income before income taxes	25,050	13,875	41,734	45,583
Total Long-Lived Assets	38,108		38,108		43,449
Total Assets	385,314		385,314		391,672
Eastern Hemisphere [Member] | Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	22	4,602	207	4,823
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Products	23,349	32,721	46,782	49,009
Services	1,601	4,062	2,971	8,589
Asia Pacific [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	25,186	37,991	50,269	59,987
Income before income taxes	5,110	9,064	11,223	12,489
Total Long-Lived Assets	54,503		54,503		55,021
Total Assets	393,128		393,128		$ 372,823
Asia Pacific [Member] | Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	$ 236	$ 1,208	$ 516	$ 2,389