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Office Closing and Exit Costs - Exit Costs Included in Accrued Liabilities in Consolidated Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014
Exit costs included in accrued liabilities in consolidated balance sheet
Accrued termination costs	$ 8,371us-gaap_RestructuringCharges	$ 8,371us-gaap_RestructuringCharges
Ending balance	$ 8,371us-gaap_RestructuringReserve	$ 8,371us-gaap_RestructuringReserve

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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