Segment Information - Summary of Company's Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Net sales
Net sales	$ 108,413	$ 99,239	$ 315,467	$ 281,320
Income taxes
Income taxes	(1,198)	3,461	3,390	6,163
Net income (loss)
Net income (loss)	9,054	6,278	21,318	11,952
Assets
Identifiable assets	363,969		363,969		$ 359,785
PLP-USA [Member]
Net sales
Net sales	46,189	40,181	128,296	113,130
Income taxes
Income taxes	(1,968)	1,666	(743)	1,706
Net income (loss)
Net income (loss)	6,200	1,918	9,759	2,235
Assets
Identifiable assets	125,111		125,111		116,484
The Americas [Member]
Net sales
Net sales	14,662	18,425	52,217	51,821
Income taxes
Income taxes	213	1,117	2,581	2,632
Net income (loss)
Net income (loss)	811	2,250	6,611	5,825
Assets
Identifiable assets	64,965		64,965		70,720
EMEA [Member]
Net sales
Net sales	18,273	15,190	54,756	46,620
Income taxes
Income taxes	230	531	889	1,109
Net income (loss)
Net income (loss)	805	1,259	2,729	2,547
Assets
Identifiable assets	60,565		60,565		62,524
Asia-Pacific [Member]
Net sales
Net sales	29,289	25,443	80,198	69,749
Income taxes
Income taxes	327	147	663	716
Net income (loss)
Net income (loss)	1,238	851	2,219	1,345
Assets
Identifiable assets	113,328		113,328		$ 110,057
Intersegment Eliminations [Member]
Net sales
Net sales	(11,403)	(5,910)	(26,531)	(19,772)
Intersegment Eliminations [Member] | PLP-USA [Member]
Net sales
Net sales	(4,862)	(2,458)	(9,296)	(8,476)
Intersegment Eliminations [Member] | The Americas [Member]
Net sales
Net sales	(2,622)	(1,284)	(7,204)	(3,992)
Intersegment Eliminations [Member] | EMEA [Member]
Net sales
Net sales	(510)	(266)	(1,350)	(866)
Intersegment Eliminations [Member] | Asia-Pacific [Member]
Net sales
Net sales	$ (3,409)	$ (1,902)	$ (8,681)	$ (6,438)