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Acquisitions - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2016
Apr. 06, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Business Acquisition [Line Items]              
Goodwill     $ 182,636   $ 182,636   $ 182,185
Net sales     256,145 $ 200,880 490,786 $ 361,677  
Segment operating income (loss):     24,181 4,498 35,923 14,780  
Accelerated vesting costs       1,900   1,900  
Performance Materials              
Business Acquisition [Line Items]              
Goodwill     7,908   7,908   $ 7,908
Net sales     24,878 26,200 50,254 50,983  
SL Industries, Inc. (SLI) and EME              
Business Acquisition [Line Items]              
Net sales         477,963    
Net income         $ 4,286    
SL Industries, Inc. (SLI) and EME | Minimum              
Business Acquisition [Line Items]              
Useful lives         10 years    
SL Industries, Inc. (SLI) and EME | Maximum              
Business Acquisition [Line Items]              
Useful lives         15 years    
SL Industries, Inc. (SLI)              
Business Acquisition [Line Items]              
Share price (in dollars per share)   $ 40.00          
Unowned voting interests acquired   60.00%          
Goodwill   $ 54,231          
Business combination, contingent liabilities   10,900          
Net sales     50,500 11,800 $ 95,400 11,800  
Segment operating income (loss):     5,400 $ (3,300) 7,800 $ (3,300)  
Net assets acquired   161,985          
Other intangibles   $ 92,326          
SL Industries, Inc. (SLI) | Minimum              
Business Acquisition [Line Items]              
Useful lives   10 years          
SL Industries, Inc. (SLI) | Trade Names              
Business Acquisition [Line Items]              
Acquired intangibles   $ 14,700          
SL Industries, Inc. (SLI) | Customer relationships              
Business Acquisition [Line Items]              
Acquired intangibles   59,900          
SL Industries, Inc. (SLI) | Technology-based intangible assets              
Business Acquisition [Line Items]              
Acquired intangibles   10,700          
SL Industries, Inc. (SLI) | Backlog              
Business Acquisition [Line Items]              
Acquired intangibles   $ 6,900          
SL Industries, Inc. (SLI) | Backlog | Minimum              
Business Acquisition [Line Items]              
Useful lives   2 months          
SL Industries, Inc. (SLI) | Backlog | Maximum              
Business Acquisition [Line Items]              
Useful lives   8 months          
Electromagnetic Enterprise (EME)              
Business Acquisition [Line Items]              
Net sales     11,000   27,500    
Segment operating income (loss):     $ 1,000   2,300    
SPLP | SL Industries, Inc. (SLI)              
Business Acquisition [Line Items]              
Ownership percentage   25.10%          
Purchase price   $ 162,000          
SL Industries, Inc. (SLI) | Electromagnetic Enterprise (EME)              
Business Acquisition [Line Items]              
Goodwill $ 30,994            
Net assets acquired 60,329            
Acquisitions, net of cash acquired         $ 2,200    
Other intangibles 28,370            
SL Industries, Inc. (SLI) | Electromagnetic Enterprise (EME) | Performance Materials              
Business Acquisition [Line Items]              
Goodwill $ 30,994            
SL Industries, Inc. (SLI) | Electromagnetic Enterprise (EME) | Customer relationships              
Business Acquisition [Line Items]              
Useful lives 15 years            
Other intangibles $ 27,200            
SL Industries, Inc. (SLI) | Electromagnetic Enterprise (EME) | Backlog              
Business Acquisition [Line Items]              
Other intangibles $ 1,200