Insurance Deductible Per Occurence

No definition available.

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- Definition

The maximum liability of the Company for self-insured events.

+ References

No definition available.

+ Details

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- Definition

Percent Threshold Used To Define More Likely Than Not For Tax Purposes

+ References

No definition available.

+ Details

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- Definition

Refurbishment of Equipment

+ References

No definition available.

+ Details

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- Details

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- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 93-7

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 720

-SubTopic 35

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13537-108611

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13531-108611

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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- Definition

Maintenance costs incurred and directly related to services rendered by an entity during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(d))

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)

-URI http://asc.fasb.org/extlink&oid=6600647&loc=d3e214044-122780

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- Definition

The maximum useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 35

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6904245&loc=d3e15217-109273

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 35

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6904245&loc=d3e15300-109273

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 35

-Paragraph 2

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- Definition

The minimum useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company.

+ References

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- Definition

Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost.

+ References

No definition available.

+ Details

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- Definition

The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References

No definition available.

+ Details

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- Definition

The minimum useful life of long lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References

No definition available.

+ Details

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Summary Of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Significant Accounting Policies [Line Items]
Deferred revenue	$ 16,000,000	$ 12,000,000
Advertising expense	0	2,000,000	6,000,000
Insurance Stop Loss Limit Self Insured Events	600,000
Percent Threshold Used To Define More Likely Than Not For Tax Purposes	50.00%
Revenue [Member] \| Customer Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentration risk, percentage	1.00%	1.00%	1.00%
Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Concentration risk, percentage	2.00%	1.00%
General Liability [Member]
Significant Accounting Policies [Line Items]
Insurance deductible, per occurence	2,000,000
Workers Compensation [Member]
Significant Accounting Policies [Line Items]
Insurance deductible, per occurence	1,000,000
Automobile Liability [Member]
Significant Accounting Policies [Line Items]
Insurance deductible, per occurence	2,000,000
Noncompete Agreements [Member]
Significant Accounting Policies [Line Items]
Finite lived intangible assets, minimum life (in years)	2
Finite lived intangible assets, maximum life (in years)	5
Customer Relationships [Member]
Significant Accounting Policies [Line Items]
Finite lived intangible assets, minimum life (in years)	8
Finite lived intangible assets, maximum life (in years)	12
Assets Leased to Others [Member]
Significant Accounting Policies [Line Items]
PP&E minimum useful life (in years)	2
PP&E maximum useful life (in years)	12
PP&E additions	10,000,000	12,000,000	33,000,000
Cost of services, maintenance costs	$ 291,000,000	$ 262,000,000	$ 256,000,000
Other Capitalized Property Plant and Equipment [Member]
Significant Accounting Policies [Line Items]
PP&E minimum useful life (in years)	2
PP&E maximum useful life (in years)	39
Minimum [Member] \| Assets Leased to Others [Member]
Significant Accounting Policies [Line Items]
PP&E salvage value (in percent)	0.00%
Maximum [Member] \| Assets Leased to Others [Member]
Significant Accounting Policies [Line Items]
PP&E salvage value (in percent)	10.00%