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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

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