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Office Closing and Termination Costs - Exit Costs Included in Accrued Liabilities in Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2014
Sep. 30, 2015
Exit costs included in accrued liabilities in consolidated balance sheet    
Beginning balance   $ 5,372
Additional accrued termination costs $ 5,372 1,414
Accrued building rent   3,270
Payments   (7,793)
Ending balance $ 5,372 $ 2,263