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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	6 Months Ended
	Apr. 30, 2001 Miami Airport Litigation	Jun. 30, 2011 Brendan Airways Litigation
Legal Matters
Number of defendants	17
Number of Potentially Responsible Parties	250
Number of subsidiaries that received a letter	1
Number of subsidiaries involved in dispute		1
Damages sought by Brendan, plus interest and attorney's fees		$ 4.5

X

- Definition

Represents the number of subsidiaries of the entity to whom the County sent a letter.

+ Details

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X

- Definition

Represents the number of defendants against whom suit was filed to seek reimbursement for the cost of remediating environmental contamination.

+ Details

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X

- Definition

Represents the number of potentially responsible parties including the entity, who were advised of their potential liability for the clean-up costs of the contamination that is the subject of the County Suit.

+ Details

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X

- Definition

Represents the number of subsidiaries of the entity, which were involved in the dispute.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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X

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 9
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-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349

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-Publisher FASB
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-Number 5
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-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.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 10
-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.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 12
-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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