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Reconciliation of Net Income (Loss) to Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Special charges	$ 30,074	$ 1,750	$ 30,074	$ 6,811
Unallocated Corporate Expenses
Segment Reporting Information [Line Items]
Special charges	$ 3,244		$ 3,244

X

- Definition

The charge against earnings in the period, comprised of costs associated with non-recurring activities related to our global branding strategy and other strategic branding decisions, a realignment of our workforce and consolidation of office locations.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: