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Acquisition (Details) - Timco Services, Inc.
 3 Months Ended 6 Months Ended
Apr. 01, 2015
USD ($)
payment
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Business Acquisition [Line Items]          
Cash payment to acquire business $ 81,000,000        
Tax reimbursement payment 8,000,000        
Contingent consideration, maximum $ 20,000,000.0        
Number of contingent payments | payment 2        
Amount of contingent payments $ 10,000,000        
Contingent consideration, liability   $ 7,000   $ 7,000  
Goodwill 4,900,000        
Intangible assets acquired $ 7,900,000        
Amortization expense for intangible assets   $ 400,000 $ 400,000 $ 900,000 $ 400,000