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Office Closing and Exit Activities - Additional Information (Detail) (USD $)	12 Months Ended	3 Months Ended
	Dec. 31, 2010	Mar. 31, 2010 Ohio [Member]	Mar. 31, 2010 Ohio [Member] Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Accrued severance costs	$ 5,138,000	$ 5,100,000
Increasing in termination costs for stock compensation expense			$ 2,800,000

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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