Related Party Transactions (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 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	0.6	0.6	1.2	1.2
O&G
Related party transactions
Ownership percentage in joint venture			30.00%
Estimated total contract value	$ 363		$ 363
Number of Company's shares of common stock held by related party joint venture partner (in shares)	600,000	600,000	600,000	600,000
Percentage of common stock held by related party	1.25%	1.26%	1.25%	1.26%

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.

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No definition available.

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- Definition

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

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No definition available.

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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.

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No definition available.

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- Definition

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

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No definition available.

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- Definition

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

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No definition available.

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- Definition

Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

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No definition available.

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Balance Type:	debit
Period Type:	duration

- Details

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