Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities:
Net income	$ 45,709us-gaap_NetIncomeLoss	$ 43,397us-gaap_NetIncomeLoss	$ 44,777us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	81,125	76,849	72,476
Provision for doubtful accounts	1,825us-gaap_ProvisionForDoubtfulAccounts	2,144us-gaap_ProvisionForDoubtfulAccounts	4,263us-gaap_ProvisionForDoubtfulAccounts
Share-based compensation	3,854us-gaap_ShareBasedCompensation	3,680us-gaap_ShareBasedCompensation	3,840us-gaap_ShareBasedCompensation
Gain on sale of used rental equipment	(15,368)us-gaap_GainLossOnSaleOfProperties	(13,091)us-gaap_GainLossOnSaleOfProperties	(12,389)us-gaap_GainLossOnSaleOfProperties
Gain on sale of property, plant and equipment	(812)
Foreign currency exchange (gain) loss	331	189	(35)
Change in:
Accounts receivable	(15,469)	2,462	(3,848)
Prepaid expenses and other assets	(13,652)	8,265	(2,337)
Accounts payable and accrued liabilities	10,662	6,506	(3,421)
Deferred income	5,136	(2,921)	1,857
Deferred income taxes	19,645	22,693	21,198
Net cash provided by operating activities	122,986	133,643	126,381
Cash Flows from Investing Activities:
Purchases of rental equipment	(152,197)	(132,611)	(131,805)
Purchases of property, plant and equipment	(12,740)	(11,973)	(14,161)
Proceeds from sale of used rental equipment	32,556	33,380	30,970
Proceeds from sale of property, plant and equipment	2,501
Net cash used in investing activities	(129,880)	(111,204)	(114,996)
Cash Flows from Financing Activities:
Net borrowings (repayments) under bank lines of credit	12,475	(11,997)	5,500
Borrowings under Series B senior notes	40,000
Principal payments on Series A senior notes	(20,000)us-gaap_RepaymentsOfSeniorDebt
Proceeds from the exercise of stock options	1,729	15,067	5,841
Excess tax benefit from exercise and disqualifying disposition of stock options	1,822	1,329	1,033
Taxes paid related to net share settlement of stock awards	(3,959)	(2,395)	(250)
Payment of dividends	(25,551)us-gaap_PaymentsOfDividends	(24,423)us-gaap_PaymentsOfDividends	(23,126)us-gaap_PaymentsOfDividends
Net cash provided by (used in) financing activities	6,516	(22,419)	(11,002)
Effect of foreign currency exchange rate changes on cash	(85)	(2)
Net increase (decrease) in cash	(463)	18	383
Cash balance, beginning of period	1,630	1,612	1,229
Cash balance, end of period	1,167	1,630	1,612
Interest paid, during the period	9,074us-gaap_InterestPaid	8,813us-gaap_InterestPaid	9,107us-gaap_InterestPaid
Net income taxes paid, during the period	22,275us-gaap_IncomeTaxesPaidNet	11,074us-gaap_IncomeTaxesPaidNet	5,842us-gaap_IncomeTaxesPaidNet
Dividends accrued during the period, not yet paid	6,526	6,373	6,194
Rental equipment acquisitions, not yet paid	$ 4,942	$ 8,533	$ 4,491

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.5)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 5

-Article 5

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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