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Acquisitions (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2013
Acquisition of Ottomotores [Member]
Dec. 31, 2012
Acquisition of Ottomotores [Member]
Dec. 31, 2012
Acquisition of Ottomotores [Member]
Minimum [Member]
kW
Dec. 31, 2012
Acquisition of Ottomotores [Member]
Maximum [Member]
kW
Sep. 30, 2013
Acquisition of Magnum [Member]
Dec. 31, 2011
Acquisition of Magnum [Member]
Dec. 31, 2013
Acquisition of Tower Light [Member]
Dec. 31, 2013
Acquisition of Tower Light [Member]
Country
Business Acquisition [Line Items]                      
Date of acquisition agreement         Dec. 08, 2012       Oct. 03, 2011   Aug. 01, 2013
Industrial diesel gensets size           15 250        
Goodwill $ 57,044 $ 5,545     $ 5,050       $ 20,337 $ 38,400 $ 38,400
Additional goodwill recorded under revised purchase accounting estimates                   9,328  
Cash paid, net of cash acquired 116,113 47,044 83,907   44,769       83,907   80,239
Intangible assets         16,100       56,107 67,900 67,900
Purchase price 122,391 47,044             85,490 85,812 85,812
Recorded estimated liability to sellers for contingent consideration                 1,583    
Decrease in purchase price       6,278       75     300
Additional intangible assets       2,590              
Decrease in goodwill       439       75      
Number of countries in which subsidiary of entity built leading market position in equipment rental markets                     50
Cash deposit into escrow account to fund future earn-out payments                   6,645 6,645
Total cash paid 116,113 47,044 83,907   44,769       83,907   80,239
Estimated earn-out payment $ 12,518 $ 0               $ 12,500 $ 12,500