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Segment Information - Summary of Company's Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales
Net sales									$ 388,185us-gaap_SalesRevenueGoodsNet	$ 409,776us-gaap_SalesRevenueGoodsNet	$ 439,192us-gaap_SalesRevenueGoodsNet
Interest income
Interest income									483us-gaap_InvestmentIncomeInterest	618us-gaap_InvestmentIncomeInterest	648us-gaap_InvestmentIncomeInterest
Interest expense
Interest expense									(658)us-gaap_InterestExpense	(450)us-gaap_InterestExpense	(597)us-gaap_InterestExpense
Income taxes
Income taxes									8,549us-gaap_IncomeTaxExpenseBenefit	11,207us-gaap_IncomeTaxExpenseBenefit	15,541us-gaap_IncomeTaxExpenseBenefit
Net income
Net income	2,488us-gaap_ProfitLoss	2,555us-gaap_ProfitLoss	5,080us-gaap_ProfitLoss	2,738us-gaap_ProfitLoss	3,132us-gaap_ProfitLoss	6,104us-gaap_ProfitLoss	6,386us-gaap_ProfitLoss	4,965us-gaap_ProfitLoss	12,861us-gaap_ProfitLoss	20,587us-gaap_ProfitLoss	29,286us-gaap_ProfitLoss
Expenditure for long-lived assets
Expenditure for long-lived assets									17,663	21,034	21,043
Depreciation and amortization
Depreciation and amortization									12,857	12,088	11,564
Identifiable assets
Assets	353,967us-gaap_Assets				332,406us-gaap_Assets				353,967us-gaap_Assets	332,406us-gaap_Assets
Operating Segments [Member] \| PLP-USA [Member]
Net sales
Net sales									137,564	144,054	162,027
Interest income
Interest income									0	0	3
Interest expense
Interest expense									(427)	(305)	(437)
Income taxes
Income taxes									5,053	6,286	9,581
Net income
Net income									7,933	10,875	13,290
Expenditure for long-lived assets
Expenditure for long-lived assets									7,536	12,262	6,702
Depreciation and amortization
Depreciation and amortization									4,140	3,793	3,520
Identifiable assets
Assets	99,850				90,414				99,850	90,414
Long-lived assets
Long-lived assets	39,848				36,888				39,848	36,888
Operating Segments [Member] \| The Americas [Member]
Net sales
Net sales									90,871	91,497	92,584
Interest income
Interest income									129	290	283
Interest expense
Interest expense									(130)	(41)	(58)
Income taxes
Income taxes									453	2,585	2,722
Net income
Net income									1,947	5,896	6,763
Expenditure for long-lived assets
Expenditure for long-lived assets									4,925	3,107	2,781
Depreciation and amortization
Depreciation and amortization									2,845	2,444	2,565
Identifiable assets
Assets	85,017				73,200				85,017	73,200
Long-lived assets
Long-lived assets	20,734				19,168				20,734	19,168
Operating Segments [Member] \| EMEA [Member]
Net sales
Net sales									65,446	61,543	66,272
Interest income
Interest income									223	215	209
Interest expense
Interest expense									(54)	(68)	(50)
Income taxes
Income taxes									2,122	2,052	2,769
Net income
Net income									6,192	6,047	6,840
Expenditure for long-lived assets
Expenditure for long-lived assets									1,375	2,573	2,816
Depreciation and amortization
Depreciation and amortization									1,790	1,792	1,714
Identifiable assets
Assets	51,691				51,345				51,691	51,345
Long-lived assets
Long-lived assets	12,504				14,467				12,504	14,467
Operating Segments [Member] \| Asia-Pacific [Member]
Net sales
Net sales									94,304	112,682	118,309
Interest income
Interest income									131	113	153
Interest expense
Interest expense									(47)	(36)	(52)
Income taxes
Income taxes									921	284	469
Net income
Net income									(3,211)	(2,231)	2,393
Expenditure for long-lived assets
Expenditure for long-lived assets									3,827	3,092	8,744
Depreciation and amortization
Depreciation and amortization									4,082	4,059	3,765
Identifiable assets
Assets	117,093				117,129				117,093	117,129
Long-lived assets
Long-lived assets	29,445				29,938				29,445	29,938
Segment Reconciling Items [Member]
Net sales
Net sales									388,185	409,776	439,192
Interest income
Interest income									483	618	648
Interest expense
Interest expense									(658)	(450)	(597)
Income taxes
Income taxes									8,549	11,207	15,541
Net income
Net income									12,861	20,587	29,286
Expenditure for long-lived assets
Expenditure for long-lived assets									17,663	21,034	21,043
Depreciation and amortization
Depreciation and amortization									12,857	12,088	11,564
Identifiable assets
Assets	353,651				332,088				353,651	332,088
Long-lived assets
Long-lived assets	102,531				100,461				102,531	100,461
Intersegment Eliminations [Member]
Intersegment sales
Intersegment sales									32,398	31,714	35,386
Intersegment Eliminations [Member] \| PLP-USA [Member]
Intersegment sales
Intersegment sales									12,721	12,939	8,537
Intersegment Eliminations [Member] \| The Americas [Member]
Intersegment sales
Intersegment sales									5,908	6,204	7,501
Intersegment Eliminations [Member] \| EMEA [Member]
Intersegment sales
Intersegment sales									1,848	2,080	4,582
Intersegment Eliminations [Member] \| Asia-Pacific [Member]
Intersegment sales
Intersegment sales									11,921	10,491	14,766
Corporate, Non-Segment [Member]
Identifiable assets
Assets	$ 316				$ 318				$ 316	$ 318