Subsequent Events - Additional Information (Detail) (USD $)
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 29, 2015
Apr. 16, 2015
Jan. 21, 2015
Dec. 31, 2014
Nov. 06, 2013
Apr. 30, 2015
Apr. 17, 2015
Subsequent Event [Line Items]                  
Proceeds from sale of rental fleet units $ 4,842,000 $ 5,627,000              
Impairment loss 64,726,000 283,000              
Stock repurchase program, current amount             125,000,000    
Treasury stock, at cost 80,960,000         65,676,000      
Dividend payable         $ 0.187        
Dividend payable date Mar. 19, 2015                
Stockholder of record date Mar. 05, 2015                
Subsequent Event                  
Subsequent Event [Line Items]                  
Increased value of shares under stock repurchase program                 50,000,000
Stock repurchase program, current amount                 175,000,000
Amount available for repurchase under stock repurchase program               135,000,000  
Dividend payable     $ 0.187            
Dividend payable date     Jun. 03, 2015            
Stockholder of record date     May 20, 2015            
Subsequent Event | Share Repurchase Program                  
Subsequent Event [Line Items]                  
Treasury stock, at cost               40,000,000  
Wood mobile offices                  
Subsequent Event [Line Items]                  
Definitive agreement date Apr. 16, 2015                
Impairment loss 64,726,000                
Expected timing of transaction The transaction is expected to be completed in May 2015                
Wood mobile offices | Subsequent Event | Scenario Plan                  
Subsequent Event [Line Items]                  
Proceeds from sale of rental fleet units       92,000,000          
Divestiture-related expenses       2,000,000          
Deferred revenue       $ 6,600,000