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Acquisition of Professional Power Products, Inc. - Estimated Useful Lives of Identifiable Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Finite-Lived Intangible Assets [Line Items]  
Total identifiable intangible assets $ 23,500
Backlog [Member]
  
Finite-Lived Intangible Assets [Line Items]  
Total identifiable intangible assets 1,200
Finite lived intangible asset estimated life 18 months
Customer relationships [Member]
  
Finite-Lived Intangible Assets [Line Items]  
Total identifiable intangible assets 20,600
Finite lived intangible asset estimated life 13 years
Trade names and trademarks [Member]
  
Finite-Lived Intangible Assets [Line Items]  
Total identifiable intangible assets $ 1,700
Finite lived intangible asset estimated life 13 years