Related Party Transactions (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 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	0.6	0.6
O&G
Related party transactions
Company's share of revenues of joint ventures where the joint venture partner is a related party	$ 1.8	$ 1.5
Maximum percentage of revenues earned from joint ventures where the joint venture partner is a related party	1.00%	1.00%
Number of Company's shares of common stock held by related party joint venture partner (in shares)	600,000	600,000
Percentage of common stock held by related party	1.26%	1.27%

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

No definition available.

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- Definition

Amount of contract revenues earned from a construction joint venture project. The vice chairman of that partner Company is a related party to the Company as he is also a director of the Company.

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No definition available.

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- Definition

Represents the maximum percentage of revenues earned from the joint venture transactions as a percentage of the Company's consolidated revenues for the reporting period.

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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 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

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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