Geographic Areas - Schedule of Segment Reporting (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Products	$ 172,001	$ 160,485
Services	32,072	32,670
Intercompany	11,834	12,673
Eliminations	(11,834)	(12,673)
Total revenues	204,073	193,155
Total long-lived assets	321,645		315,799
Income before income taxes	58,643	52,279
Total assets	1,460,049		1,394,612
Eliminations [Member]
Segment Reporting Information [Line Items]
Income before income taxes	1,681	634
Total long-lived assets eliminations	(2,927)		(2,927)
Total assets eliminations	(33,837)		(17,530)
Western Hemisphere [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Products	94,389	99,729
Services	16,900	15,629
Intercompany	10,292	12,387
Total revenues	121,581	127,745
Total long-lived assets	220,490		216,104
Income before income taxes	36,160	24,946
Total assets	851,096		803,069
Eastern Hemisphere [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Products	53,923	37,833
Services	11,477	12,167
Intercompany	174	155
Total revenues	65,574	50,155
Total long-lived assets	46,973		43,430
Income before income taxes	15,347	17,008
Total assets	333,830		316,473
Asia-Pacific [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Products	23,689	22,923
Services	3,695	4,874
Intercompany	1,368	131
Total revenues	28,752	27,928
Total long-lived assets	57,109		59,192
Income before income taxes	5,455	9,691
Total assets	$ 308,960		$ 292,600