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Compensation Arrangements	12 Months Ended
	Dec. 31, 2011
Compensation Arrangements
Compensation Arrangements	16.   Compensation Arrangements         In connection with a previous acquisition, CRA has agreed to pay an award to certain employees of the acquired business if they achieve specific performance targets through fiscal 2012. Retention of amounts paid to the individual employees is contingent on their continued employment with CRA through 2016. As of December 31, 2011, based upon performance to date and expected performance in the future, the amount of the award is estimated to be approximately $9.6 million and is being expensed over the seven and a half year service period ending in December 2016. Changes in the estimated award are expensed prospectively over the remaining service period. To date, the Company has expensed $1.7 million for this award, of which $1.6 million was expensed in fiscal 2011. The amount of the award could fluctuate depending on future performance. Any payments under this award would be made in fiscal 2013.

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The entire disclosure for compensation costs, including compensated absences accruals, compensated absences liability, deferred compensation arrangements and income statement compensation items. Deferred compensation arrangements may include a description of an arrangement with an individual employee, which is generally an employment contract between the entity and a selected officer or key employee containing a promise by the employer to pay certain amounts at designated future dates, usually including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period, the number of shares (units) issued during the period under such arrangements, and the carrying amount as of the balance sheet date of the related liability.

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