Geographic Areas - Schedule of Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Products	$ 157,790	$ 198,827	$ 521,413	$ 560,742
Services	43,612	42,923	121,267	115,396
Intercompany	20,043	26,913	52,010	52,097
Eliminations	(20,043)	(26,913)	(52,010)	(52,097)
Total revenues	201,402	241,750	642,680	676,138
Total Long-Lived Assets	304,293		304,293		$ 322,111
Income before income taxes	64,596	73,195	189,076	201,053
Total Assets	1,438,120		1,438,120		1,449,251
Eliminations [Member]
Segment Reporting Information [Line Items]
Income before income taxes	203	(567)	6,647	2,639
Total Long-Lived Assets Eliminations	(2,926)		(2,926)		(2,926)
Total Assets Eliminations	(17,299)		(17,299)		(12,307)
Western Hemisphere [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Products	75,681	101,833	250,056	312,175
Services	23,285	20,397	67,092	55,678
Intercompany	17,002	19,501	41,757	38,856
Total revenues	115,968	141,731	358,905	406,709
Total Long-Lived Assets	208,406		208,406		221,597
Income before income taxes	23,536	34,496	83,500	106,666
Total Assets	707,263		707,263		731,448
Eastern Hemisphere [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Products	44,955	53,894	185,194	151,631
Services	15,128	17,587	40,387	45,578
Intercompany	549	7,018	5,372	10,517
Total revenues	60,632	78,499	230,953	207,726
Total Long-Lived Assets	42,946		42,946		45,517
Income before income taxes	24,386	25,620	69,969	56,794
Total Assets	392,007		392,007		375,781
Asia-Pacific [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Products	37,154	43,100	86,163	96,936
Services	5,199	4,939	13,788	14,140
Intercompany	2,492	394	4,881	2,724
Total revenues	44,845	48,433	104,832	113,800
Total Long-Lived Assets	55,867		55,867		57,923
Income before income taxes	16,471	$ 13,646	28,960	$ 34,954
Total Assets	$ 356,149		$ 356,149		$ 354,329