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Fair Value Measurements - Summary of Changes in Fair Value of Company's Level 3 Assets and Liabilities (Parenthetical) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Equities [Member]      
Fair Value of Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]      
Net unrealized gains $ 243 $ 14 $ 19
Contingent Consideration Liability [Member] | Edgewater Acquisition [Member]      
Fair Value of Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]      
Net unrealized losses 2,658    
Net realized losses $ 30,067