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Percentage of Revenue by Geographic Area (Detail) - Geographic Concentration Risk - Total Revenue	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Revenues, percentage by country	100.00%	100.00%	100.00%
North America
Concentration Risk [Line Items]
Revenues, percentage by country	48.00%	43.00%	39.00%
Europe
Concentration Risk [Line Items]
Revenues, percentage by country	40.00%	46.00%	54.00%
APAC
Concentration Risk [Line Items]
Revenues, percentage by country	12.00%	11.00%	7.00%
Other
Concentration Risk [Line Items]
Revenues, percentage by country	0.00%	0.00%	0.00%

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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.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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