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Intangible Assets - Narrative (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 1,800	$ 2,000
Historical Cost	63,811		$ 63,811
Accumulated Amortization	(43,301)		(39,731)
Net Balance	$ 20,510		24,080
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Useful Life	9 years 4 months 24 days
Historical Cost	$ 56,453		56,453
Accumulated Amortization	(38,487)		(35,469)
Net Balance	$ 17,966		20,984
Tradenames and trademarks
Finite-Lived Intangible Assets [Line Items]
Useful Life	7 years 5 months
Historical Cost	$ 6,786		6,786
Accumulated Amortization	(4,543)		(4,029)
Net Balance	$ 2,243		2,757
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Useful Life	6 years
Historical Cost	$ 572		572
Accumulated Amortization	(271)		(233)
Net Balance	$ 301		$ 339

X

- Definition

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.

+ References

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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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.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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