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Identifiable Intangible Assets from Acquisitions - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets from acquisitions	$ 1,568
Estimated remaining amortization expense in 2019	4,600
Estimated amortization expense in 2020	5,700
Estimated amortization expense in 2021	4,200
Estimated amortization expense in 2022	2,500
Estimated amortization expense in 2023	$ 2,100
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Weighted average useful life	5 years
Technologies
Finite Lived Intangible Assets [Line Items]
Weighted average useful life	3 years
Tradenames
Finite Lived Intangible Assets [Line Items]
Weighted average useful life	2 years
Non-compete Agreements | Minimum
Finite Lived Intangible Assets [Line Items]
Weighted average useful life	1 year
Non-compete Agreements | Maximum
Finite Lived Intangible Assets [Line Items]
Weighted average useful life	2 years

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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