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Goodwill and intangible assets (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 34,883 | $ 34,883
AccumulatedAmortization | 6,153 | 5,432
Net | $ 28,730 | 29,451
Licenses [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 10 years |
Gross Carrying Amount | $ 1,000 | 1,000
AccumulatedAmortization | 442 | 417
Net | $ 558 | 583
Patents [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 5 years |
Gross Carrying Amount | $ 386 | 386
AccumulatedAmortization | 381 | 380
Net | 5 | 6
Covenant Not to Compete [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,270 | 1,270
AccumulatedAmortization | 667 | 629
Net | $ 603 | 641
Covenant Not to Compete [Member] | Maximum [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 10 years |
Covenant Not to Compete [Member] | Minimum [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 6 years |
Customer Relationships [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 31,660 | 31,660
AccumulatedAmortization | 4,598 | 3,952
Net | $ 27,062 | 27,708
Customer Relationships [Member] | Maximum [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 12 years |
Customer Relationships [Member] | Minimum [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 10 years |
Above Market Leases [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 13 years |
Gross Carrying Amount | $ 567 | 567
AccumulatedAmortization | 65 | 54
Net | $ 502 | $ 513

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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://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 + Details
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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 Reference 2: 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 + Details
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