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Goodwill and Intangible Assets, net - Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	$ 50,971	$ 38,979
Accumulated Amortization	(27,543)	(23,168)
Foreign Currency Translation	(687)	718
Net	22,741	16,529
Subscriber Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	43,212	34,350
Accumulated Amortization	(23,284)	(19,592)
Foreign Currency Translation	(623)	614
Net	19,305	15,372
Non-competition Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	2,560	2,499
Accumulated Amortization	(2,247)	(2,058)
Foreign Currency Translation	(28)	45
Net	285	486
Technology and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Carrying Amount	5,199	2,130
Accumulated Amortization	(2,012)	(1,518)
Foreign Currency Translation	(36)	59
Net	$ 3,151	$ 671

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

Amount before 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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+ References

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