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Acquisitions - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2015
May. 19, 2015
May. 01, 2015
Mar. 18, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Business Acquisition [Line Items]                  
Business acquisition, contingent consideration liability                 $ 8,900,000
Increased finished goods inventory             $ (589,000) $ 23,398,000  
Cost of sales         $ 96,700,000 $ 75,344,000 243,637,000 198,131,000  
Operating income (loss)         1,388,000 7,519,000 9,933,000 16,933,000  
Amortization expense         1,099,000 492,000 2,755,000 492,000  
Total transaction cost related to acquisition         $ 79,000   $ 526,000    
5.50% Senior Notes [Member]                  
Business Acquisition [Line Items]                  
Interest rate on senior notes         5.50%   5.50%    
Powertrain Integration, LLC [Member]                  
Business Acquisition [Line Items]                  
Payment to acquire business   $ 20,873,000     $ 20,776,000        
Business acquisition, contingent consideration liability   8,200,000     8,200,000   $ 8,200,000    
Provisional aggregate purchase price   28,976,000              
Working capital adjustment         97,000        
Change in contingent liability $ 50,000           50,000    
Increased finished goods inventory             $ 22,000    
Accrued liabilities adjusted amount   1,166,000              
Powertrain Integration, LLC [Member] | Adjustment [Member]                  
Business Acquisition [Line Items]                  
Business acquisition, contingent consideration liability   8,200,000              
Provisional aggregate purchase price   28,976,000              
Working capital adjustment   97,000              
Accrued liabilities adjusted amount   $ 925,000              
Powertrain Integration, LLC [Member] | Weighted Average [Member]                  
Business Acquisition [Line Items]                  
Weighted average useful life             11 years 6 months    
Powertrain Integration, LLC [Member] | Minimum [Member]                  
Business Acquisition [Line Items]                  
Percentage of per annum return on base earn-out payment considered for additional earn-out payment   5.00%              
Powertrain Integration, LLC [Member] | 5.50% Senior Notes [Member]                  
Business Acquisition [Line Items]                  
Interest rate on senior notes   5.50%              
Bi-Phase Technologies, LLC [Member]                  
Business Acquisition [Line Items]                  
Interest rate on senior notes     5.50%            
Payment to acquire business     $ 3,619,000   3,885,000        
Business acquisition, contingent consideration liability     540,000   540,000   $ 540,000    
Provisional aggregate purchase price     4,425,000            
Working capital adjustment     (266,000)   (266,000)        
Increased finished goods inventory             $ 226,000    
Accrued liabilities adjusted amount     47,000            
Business acquisition agreement date             May 01, 2015    
Initial cash purchase price on acquisition     $ 3,500,000            
Bi-Phase Technologies, LLC [Member] | Weighted Average [Member]                  
Business Acquisition [Line Items]                  
Weighted average useful life             8 years 6 months    
Bi-Phase Technologies, LLC [Member] | Minimum [Member]                  
Business Acquisition [Line Items]                  
Contingent consideration, earn-out period             3 years    
Bi-Phase Technologies, LLC [Member] | Maximum [Member]                  
Business Acquisition [Line Items]                  
Contingent consideration, earn-out period             5 years    
Bi-Phase Technologies, LLC [Member] | Inventory Value [Member]                  
Business Acquisition [Line Items]                  
Cost of sales         85,000   $ 141,000    
Buck's Acquisition Company, LLC [Member]                  
Business Acquisition [Line Items]                  
Increased finished goods inventory             $ 290,000    
Business acquisition agreement date             Mar. 18, 2015    
Initial cash purchase price on acquisition       $ 9,735,000          
Buck's Acquisition Company, LLC [Member] | Inventory Value [Member]                  
Business Acquisition [Line Items]                  
Cost of sales         145,000   $ 290,000    
Professional Power Products, Inc. [Member]                  
Business Acquisition [Line Items]                  
Business acquisition, contingent consideration liability         8,150,000   8,150,000    
Net Intercompany sales         4,824,000 6,286,000 13,624,000 13,558,000  
Operating income (loss)         (3,579,000) (346,000) (8,039,000) (377,000)  
Amortization expense         $ 800,000 $ 748,000 $ 2,481,000 1,303,000  
Acquisition transaction expenses                 $ 3,474,000
Total transaction cost related to acquisition               $ 811,000