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Goodwill and Intangible Assets, net (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Amortization expense	$ 6,767	$ 8,658	$ 12,368
Energy [Member]
Percentage of estimated fair value over net asset carrying value of goodwill	32.00%
Healthcare [Member]
Percentage of estimated fair value over net asset carrying value of goodwill	17.00%
Disputes, Investigations & Economics [Member]
Percentage of estimated fair value over net asset carrying value of goodwill	18.00%
Finance, Risk & Compliance Advisory [Member]
Percentage of estimated fair value over net asset carrying value of goodwill	37.00%
Weighted Average [Member]
Estimated useful lives of intangible assets	3 years 7 months 6 days

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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