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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Segment
Product
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]      
Number of products 3    
Number of business segments 4    
Impairments of long-lived assets $ 0 $ 0 $ 0
Period for warranties for rental equipment 90 days    
Period for warranties for equipment manufactured 1 year    
Property, plant and equipment depreciation expenses 7,800,000 7,800,000 6,000,000
Capitalized in internal use of software 3,500,000 900,000  
Total advertising expenses 2,400,000 2,500,000 2,100,000
Goodwill and intangible assets 39,900,000    
Intangible assets related to customer relationships amortized year 11 years    
Goodwill and trade name intangible assets 33,400,000 33,400,000  
Goodwill and intangible assets impairment charge 0 0 0
Unbilled receivables related to end-of-lease services 18,900,000 17,400,000  
Period for credit risk identified 30 days    
Estimated fair value notes payable 104,600,000 106,000,000  
Recorded fair value of notes payable $ 100,000,000 $ 100,000,000