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Related Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Related Party Transaction Due From To Related Party [Line Items]
Revenue from contracts with affiliated entities	$ 2,300,000	$ 10,900,000
Operating Margin	11,123,000	9,455,000
General Contracting and Real Estate Services [Member]
Related Party Transaction Due From To Related Party [Line Items]
Operating Margin	$ 100,000	$ 300,000

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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