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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
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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.

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- Definition Amount of general and administrative support costs, such as labor, benefits and stock-based compensation costs. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Period Type: |