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Summary of Segment Net Revenues, Segment Operating Income (Loss) and Reconciliation of Segment Income to Consolidated Income from Continuing Operations Before Income Taxes (Parenthetical) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Corporate administrative support costs, Adjustment to reduce tax asset [1] $ 44,561 $ 18,965 $ 13,012
Tax Adjustments      
Segment Reporting Information [Line Items]      
Corporate administrative support costs, Adjustment to reduce tax asset $ 30,934    
[1] Corporate administrative support costs in 2016 also include $30,934 of an adjustment to reduce a tax asset associated with the DMG acquisition escrow provisions.