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Office Closing and Termination Costs - Exit Costs Included in Accrued Liabilities in Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Exit costs included in accrued liabilities in consolidated balance sheet    
Beginning balance $ 5,372  
Additional accrued termination costs 1,414 $ 5,372
Building lease costs 3,232 0
Payments (6,089)  
Ending balance $ 3,929 $ 5,372