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Revenue - Revenues by Segment and Product Type (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 100.00% 100.00% 100.00% 100.00%
Energy [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 62.00% 68.00% 63.00% 69.00%
Communications [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 25.00% 19.00% 24.00% 20.00%
Special Industries [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 13.00% 13.00% 13.00% 11.00%
PLP-USA [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 100.00% 100.00% 100.00% 100.00%
PLP-USA [Member] | Energy [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 63.00% 57.00% 64.00% 58.00%
PLP-USA [Member] | Communications [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 30.00% 36.00% 30.00% 36.00%
PLP-USA [Member] | Special Industries [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 7.00% 7.00% 6.00% 6.00%
The Americas [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 100.00% 100.00% 100.00% 100.00%
The Americas [Member] | Energy [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 66.00% 77.00% 63.00% 77.00%
The Americas [Member] | Communications [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 29.00% 19.00% 31.00% 19.00%
The Americas [Member] | Special Industries [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 5.00% 4.00% 6.00% 4.00%
EMEA [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 100.00% 100.00% 100.00% 100.00%
EMEA [Member] | Energy [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 48.00% 75.00% 61.00% 78.00%
EMEA [Member] | Communications [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 32.00% 6.00% 24.00% 6.00%
EMEA [Member] | Special Industries [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 20.00% 19.00% 15.00% 16.00%
Asia-Pacific [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 100.00% 100.00% 100.00% 100.00%
Asia-Pacific [Member] | Energy [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 66.00% 70.00% 64.00% 74.00%
Asia-Pacific [Member] | Communications [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 10.00% 4.00% 8.00% 5.00%
Asia-Pacific [Member] | Special Industries [Member]        
Disaggregation Of Revenue [Line Items]        
Percentage of disaggregated revenue 24.00% 26.00% 28.00% 21.00%