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Quarterly Financial Information - Quarterly Financial Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operations Data                        
Rental Revenues $ 66,181 $ 65,941 $ 63,043 $ 60,601 $ 65,117 $ 63,418 $ 60,389 $ 59,520 $ 255,766 $ 248,444 $ 234,906  
Total Revenues 94,614 108,860 87,133 88,713 101,950 99,430 83,765 78,929 379,320 364,074 342,670  
Gross Profit 44,472 45,210 40,146 38,998 44,039 43,640 40,780 39,835 168,826 168,294 166,791  
Income from Operations 21,520 22,827 18,354 17,360 21,133 22,792 19,617 18,474 80,061 82,016 88,664  
Income Before Provision for Income Taxes 19,341 20,679 16,197 15,157 18,851 20,480 17,235 16,301 71,374 72,867 81,058  
Net Income 11,761 12,573 9,848 9,215 11,936 12,451 10,479 9,911 43,397 44,777 49,602  
Earnings Per Share:                        
Basic $ 0.46 $ 0.49 $ 0.39 $ 0.37 $ 0.48 $ 0.50 $ 0.42 $ 0.40 $ 1.71 $ 1.80 $ 2.04  
Diluted $ 0.45 $ 0.48 $ 0.38 $ 0.36 $ 0.47 $ 0.50 $ 0.42 $ 0.39 $ 1.67 $ 1.78 $ 2.00  
Dividends Declared Per Share $ 0.24 $ 0.24 $ 0.24 $ 0.24 $ 0.235 $ 0.235 $ 0.235 $ 0.235 $ 0.96 $ 0.94 $ 0.92  
Shares Used in Per Share Calculations:                        
Basic 25,717 25,649 25,354 25,003 24,847 24,785 24,765 24,639 25,433 24,759 24,349  
Diluted 26,211 26,095 25,818 25,435 25,216 25,106 25,149 25,183 25,926 25,156 24,760  
Balance Sheet Data                        
Rental Equipment, net 767,010 753,810 737,636 726,100 718,853 719,636 710,918 693,577 767,010 718,853 673,146  
Total Assets 1,019,557 1,009,435 985,262 967,131 972,446 988,254 963,649 934,282 1,019,557 972,446    
Notes Payable 290,003 280,902 278,875 281,251 302,000 314,193 308,000 292,118 290,003 302,000    
Shareholders' Equity $ 401,030 $ 395,694 $ 387,779 $ 372,864 $ 364,738 $ 355,758 $ 347,500 $ 341,853 $ 401,030 $ 364,738 $ 333,142 $ 294,977