Geographic Areas - Schedule of Segment Reporting (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 108,227	$ 93,257	$ 306,353	$ 287,291
Depreciation and amortization	8,304	8,724	25,155	25,966
Income (loss) before income taxes	2,102	(12,386)	3,185	(18,492)
Total long-lived assets	326,916		326,916		$ 339,529
Total assets	1,205,635		1,205,635		1,192,510
Intercompany
Segment Reporting Information [Line Items]
Revenues	5,102	4,439	13,840	12,820
Eliminations
Segment Reporting Information [Line Items]
Revenues	(5,102)	(4,439)	(13,840)	(12,820)
Total long-lived assets	(371,575)		(371,575)		(395,938)
Total assets	(489,558)		(489,558)		(458,682)
Western Hemisphere
Segment Reporting Information [Line Items]
Revenues	60,847	62,457	173,010	187,279
Western Hemisphere | Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization	5,327	5,607	16,183	17,091
Income (loss) before income taxes	3,882	13,902	12,291	12,999
Total long-lived assets	386,571		386,571		412,624
Total assets	711,164		711,164		708,723
Western Hemisphere | Intercompany
Segment Reporting Information [Line Items]
Revenues	2,572	2,564	9,185	9,685
Western Hemisphere | Eliminations
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Eastern Hemisphere
Segment Reporting Information [Line Items]
Revenues	31,102	26,615	90,565	80,395
Eastern Hemisphere | Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization	970	1,057	3,198	3,402
Income (loss) before income taxes	11,627	8,133	25,529	13,792
Total long-lived assets	242,704		242,704		256,899
Total assets	812,930		812,930		788,171
Eastern Hemisphere | Intercompany
Segment Reporting Information [Line Items]
Revenues	72	1,302	418	1,835
Eastern Hemisphere | Eliminations
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Revenues	(5,102)	(4,439)	(13,840)	(12,820)
Depreciation and amortization	767	670	2,137	1,952
Income (loss) before income taxes	(19,458)	(34,120)	(52,586)	(45,238)
Corporate, Non-Segment | Eliminations
Segment Reporting Information [Line Items]
Revenues	(5,102)	(4,439)	(13,840)	(12,820)
Asia Pacific
Segment Reporting Information [Line Items]
Revenues	21,380	8,624	56,618	32,437
Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization	1,240	1,390	3,637	3,521
Income (loss) before income taxes	6,051	(301)	17,951	(45)
Total long-lived assets	69,216		69,216		65,944
Total assets	171,099		171,099		$ 154,298
Asia Pacific | Intercompany
Segment Reporting Information [Line Items]
Revenues	2,458	573	4,237	1,300
Asia Pacific | Eliminations
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Products | Operating Segments
Segment Reporting Information [Line Items]
Revenues	81,851	63,246	224,518	199,010
Products | Operating Segments | Transferred at Point in Time
Segment Reporting Information [Line Items]
Revenues	59,539	48,606	163,424	158,661
Products | Operating Segments | Transferred over Time
Segment Reporting Information [Line Items]
Revenues	22,312	14,640	61,094	40,349
Products | Western Hemisphere | Operating Segments
Segment Reporting Information [Line Items]
Revenues	42,560	43,825	117,820	130,259
Products | Western Hemisphere | Operating Segments | Transferred at Point in Time
Segment Reporting Information [Line Items]
Revenues	30,135	34,101	81,120	110,074
Products | Western Hemisphere | Operating Segments | Transferred over Time
Segment Reporting Information [Line Items]
Revenues	12,425	9,724	36,700	20,185
Products | Eastern Hemisphere | Operating Segments
Segment Reporting Information [Line Items]
Revenues	23,657	17,834	66,815	52,238
Products | Eastern Hemisphere | Operating Segments | Transferred at Point in Time
Segment Reporting Information [Line Items]
Revenues	18,514	12,918	50,458	35,556
Products | Eastern Hemisphere | Operating Segments | Transferred over Time
Segment Reporting Information [Line Items]
Revenues	5,143	4,916	16,357	16,682
Products | Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Revenues	15,634	1,587	39,883	16,513
Products | Asia Pacific | Operating Segments | Transferred at Point in Time
Segment Reporting Information [Line Items]
Revenues	10,890	1,587	31,846	13,031
Products | Asia Pacific | Operating Segments | Transferred over Time
Segment Reporting Information [Line Items]
Revenues	4,744		8,037	3,482
Technical Advisory | Operating Segments
Segment Reporting Information [Line Items]
Revenues	13,516	13,806	40,877	40,641
Technical Advisory | Western Hemisphere | Operating Segments
Segment Reporting Information [Line Items]
Revenues	8,165	7,305	22,118	20,835
Technical Advisory | Eastern Hemisphere | Operating Segments
Segment Reporting Information [Line Items]
Revenues	3,301	3,612	11,428	12,785
Technical Advisory | Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Revenues	2,050	2,889	7,331	7,021
Reconditioning | Operating Segments
Segment Reporting Information [Line Items]
Revenues	4,368	3,735	12,059	12,362
Reconditioning | Western Hemisphere | Operating Segments
Segment Reporting Information [Line Items]
Revenues	2,892	2,864	7,945	8,338
Reconditioning | Eastern Hemisphere | Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,353	752	3,100	2,700
Reconditioning | Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Revenues	123	119	1,014	1,324
Total Services (excluding rental tools) | Operating Segments
Segment Reporting Information [Line Items]
Revenues	17,884	17,541	52,936	53,003
Total Services (excluding rental tools) | Western Hemisphere | Operating Segments
Segment Reporting Information [Line Items]
Revenues	11,057	10,169	30,063	29,173
Total Services (excluding rental tools) | Eastern Hemisphere | Operating Segments
Segment Reporting Information [Line Items]
Revenues	4,654	4,364	14,528	15,485
Total Services (excluding rental tools) | Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Revenues	2,173	3,008	8,345	8,345
Leasing | Operating Segments
Segment Reporting Information [Line Items]
Revenues	8,492	12,470	28,899	35,278
Leasing | Western Hemisphere | Operating Segments
Segment Reporting Information [Line Items]
Revenues	4,658	5,899	15,942	18,162
Leasing | Eastern Hemisphere | Operating Segments
Segment Reporting Information [Line Items]
Revenues	2,719	3,115	8,804	10,837
Leasing | Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,115	3,456	4,153	6,279
Total Services (including rental tools) | Operating Segments
Segment Reporting Information [Line Items]
Revenues	26,376	30,011	81,835	88,281
Total Services (including rental tools) | Western Hemisphere | Operating Segments
Segment Reporting Information [Line Items]
Revenues	15,715	16,068	46,005	47,335
Total Services (including rental tools) | Eastern Hemisphere | Operating Segments
Segment Reporting Information [Line Items]
Revenues	7,373	7,479	23,332	26,322
Total Services (including rental tools) | Asia Pacific | Operating Segments
Segment Reporting Information [Line Items]
Revenues	$ 3,288	$ 6,464	$ 12,498	$ 14,624