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Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transaction [Line Items]
Revenue from client facilities in which the Related Parties have ownership interests			$ 4,145
Maximum [Member]
Related Party Transaction [Line Items]
Fees paid to related party firm, maximum	$ 125	$ 125	$ 125
Percentage of fee paid to related party in relation to related party's total revenue, maximum	5.00%	5.00%	5.00%

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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