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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, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Operations Data |  |  |  |  |  |  |  |  |  |  |  |
Rental revenues | $ 71,694 mgrc_Rental | $ 69,642 mgrc_Rental | $ 65,809 mgrc_Rental | $ 62,430 mgrc_Rental | $ 66,181 mgrc_Rental | $ 65,941 mgrc_Rental | $ 63,043 mgrc_Rental | $ 60,601 mgrc_Rental | $ 269,575 mgrc_Rental | $ 255,766 mgrc_Rental | $ 248,444 mgrc_Rental |
Total revenues | 111,792 us-gaap_Revenues | 113,025 us-gaap_Revenues | 95,745 us-gaap_Revenues | 87,560 us-gaap_Revenues | 94,772 us-gaap_Revenues | 108,839 us-gaap_Revenues | 87,156 us-gaap_Revenues | 88,742 us-gaap_Revenues | 408,122 us-gaap_Revenues | 379,509 us-gaap_Revenues | 364,039 us-gaap_Revenues |
Gross profit | 52,204 us-gaap_GrossProfit | 49,298 us-gaap_GrossProfit | 42,079 us-gaap_GrossProfit | 38,638 us-gaap_GrossProfit | 44,630 us-gaap_GrossProfit | 45,189 us-gaap_GrossProfit | 40,169 us-gaap_GrossProfit | 39,027 us-gaap_GrossProfit | 182,219 us-gaap_GrossProfit | 169,015 us-gaap_GrossProfit | 168,259 us-gaap_GrossProfit |
Income from operations | 26,796 us-gaap_OperatingIncomeLoss | 25,098 us-gaap_OperatingIncomeLoss | 18,239 us-gaap_OperatingIncomeLoss | 15,227 us-gaap_OperatingIncomeLoss | 21,678 us-gaap_OperatingIncomeLoss | 22,806 us-gaap_OperatingIncomeLoss | 18,377 us-gaap_OperatingIncomeLoss | 17,389 us-gaap_OperatingIncomeLoss | 85,360 us-gaap_OperatingIncomeLoss | 80,250 us-gaap_OperatingIncomeLoss | 81,981 us-gaap_OperatingIncomeLoss |
Income before provision for income taxes | 24,222 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 22,609 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 16,794 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 12,936 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 19,341 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 20,679 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 16,197 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 15,157 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 76,561 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 71,374 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 72,867 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
Net income | 13,887 us-gaap_NetIncomeLoss | 13,746 us-gaap_NetIncomeLoss | 10,205 us-gaap_NetIncomeLoss | 7,871 us-gaap_NetIncomeLoss | 11,761 us-gaap_NetIncomeLoss | 12,573 us-gaap_NetIncomeLoss | 9,848 us-gaap_NetIncomeLoss | 9,215 us-gaap_NetIncomeLoss | 45,709 us-gaap_NetIncomeLoss | 43,397 us-gaap_NetIncomeLoss | 44,777 us-gaap_NetIncomeLoss |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.54 us-gaap_EarningsPerShareBasic | $ 0.53 us-gaap_EarningsPerShareBasic | $ 0.39 us-gaap_EarningsPerShareBasic | $ 0.31 us-gaap_EarningsPerShareBasic | $ 0.46 us-gaap_EarningsPerShareBasic | $ 0.49 us-gaap_EarningsPerShareBasic | $ 0.39 us-gaap_EarningsPerShareBasic | $ 0.37 us-gaap_EarningsPerShareBasic | $ 1.77 us-gaap_EarningsPerShareBasic | $ 1.71 us-gaap_EarningsPerShareBasic | $ 1.80 us-gaap_EarningsPerShareBasic |
Diluted | $ 0.53 us-gaap_EarningsPerShareDiluted | $ 0.53 us-gaap_EarningsPerShareDiluted | $ 0.39 us-gaap_EarningsPerShareDiluted | $ 0.30 us-gaap_EarningsPerShareDiluted | $ 0.45 us-gaap_EarningsPerShareDiluted | $ 0.48 us-gaap_EarningsPerShareDiluted | $ 0.38 us-gaap_EarningsPerShareDiluted | $ 0.36 us-gaap_EarningsPerShareDiluted | $ 1.75 us-gaap_EarningsPerShareDiluted | $ 1.67 us-gaap_EarningsPerShareDiluted | $ 1.78 us-gaap_EarningsPerShareDiluted |
Dividends declared per share | $ 0.245 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.245 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.245 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.245 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.24 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.24 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.24 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.24 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.98 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.96 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.94 us-gaap_CommonStockDividendsPerShareDeclared |
Shares used in per share calculations: |  |  |  |  |  |  |  |  |  |  |  |
Basic | 25,999 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,953 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,912 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,789 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,717 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,649 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,354 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,003 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,914 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 25,433 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 24,759 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Diluted | 26,206 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 26,152 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 26,220 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 26,230 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 26,211 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 26,095 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 25,818 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 25,435 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 26,175 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 25,926 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 25,156 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |
Rental equipment, net | 825,750 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet | 817,898 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet | 795,532 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet | 775,875 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet | 767,010 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet | 753,810 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet | 737,636 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet | 726,100 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet | 825,750 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet | 767,010 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet | 718,853 us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet |
Total assets | 1,116,407 us-gaap_Assets | 1,089,130 us-gaap_Assets | 1,051,764 us-gaap_Assets | 1,021,613 us-gaap_Assets | 1,027,611 us-gaap_Assets | 1,009,435 us-gaap_Assets | 985,262 us-gaap_Assets | 967,131 us-gaap_Assets | 1,116,407 us-gaap_Assets | 1,027,611 us-gaap_Assets |  |
Notes payable | 322,478 us-gaap_NotesPayable | 322,280 us-gaap_NotesPayable | 307,000 us-gaap_NotesPayable | 288,081 us-gaap_NotesPayable | 290,003 us-gaap_NotesPayable | 280,902 us-gaap_NotesPayable | 278,875 us-gaap_NotesPayable | 281,251 us-gaap_NotesPayable | 322,478 us-gaap_NotesPayable | 290,003 us-gaap_NotesPayable |  |
Shareholders' equity | $ 424,531 us-gaap_StockholdersEquity | $ 414,519 us-gaap_StockholdersEquity | $ 406,439 us-gaap_StockholdersEquity | $ 401,563 us-gaap_StockholdersEquity | $ 401,030 us-gaap_StockholdersEquity | $ 395,694 us-gaap_StockholdersEquity | $ 387,779 us-gaap_StockholdersEquity | $ 372,864 us-gaap_StockholdersEquity | $ 424,531 us-gaap_StockholdersEquity | $ 401,030 us-gaap_StockholdersEquity | $ 364,738 us-gaap_StockholdersEquity | $ 333,142 us-gaap_StockholdersEquity

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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