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Summary of Segment Net Revenues, Segment Operating income (Loss) and Reconciliation of Segment Income to Consolidated Income Before Income Taxes (Detail) (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Corporate administrative support costs, Adjustment to reduce receivable	[1]	$ 28,028	$ 4,975	$ 40,366	$ 14,534
Tax Adjustments
Segment Reporting Information [Line Items]
Corporate administrative support costs, Adjustment to reduce receivable				$ 27,040
[1] Corporate administrative support costs also include $27,040 of an adjustment to reduce a receivable associated with the DMG acquisition escrow provision relating to an income tax item.

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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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Period Type:	duration

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- Details

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