Related Party Transactions (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Chairman and Chief Executive Officer
Related party transactions
Monthly payments under non-cancelable operating lease agreements	$ 0.2
Percentage increase per annum in monthly lease payments under non-cancelable operating lease agreements	3.00%
Lease expense under non-cancelable operating lease agreements	2.5	2.5	2.3
O&G
Related party transactions
Ownership percentage in joint venture	30.00%
Estimated total contract value	362
Expenses incurred with related party	7.0	6.9	6.3
Number of Company's shares of common stock held by related party joint venture partner (in shares)	500,000	600,000
Percentage of common stock held by related party	1.03%	1.24%
JF Aviation, LLC
Related party transactions
Expenses incurred with related party			$ 0.4

Number of Company's shares of common stock held by a related party joint venture partner.

No definition available.

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- Definition

Represents the monthly lease payment under non-cancelable operating leases.

+ References

No definition available.

+ Details

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- Definition

Percentage represents the Company's ownership percentage in the joint venture.

+ References

No definition available.

+ Details

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- Definition

Percentage increase per annum in the monthly payments under non-cancelable operating lease agreements with the Company's chairman and chief executive officer and an affiliate owned by the Company's chairman and chief executive office, beginning August 1, 2009 and expiring on July 31, 2016.

+ References

No definition available.

+ Details

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- Definition

Related party's cumulative holdings, in percentage, of the entity's stock on the date of balance sheet.

+ References

No definition available.

+ Details

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- Definition

Represents the amount of the estimated contract value related to the highway construction project.

+ References

No definition available.

+ Details

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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- Details

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