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Goodwill and intangible assets (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 34,913 | $ 34,913
AccumulatedAmortization | 4,719 | 2,494
Net | $ 30,194 | 32,419
Licenses [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 10 years |
Gross Carrying Amount | $ 1,000 | 1,000
AccumulatedAmortization | 392 | 317
Net | $ 608 | 683
Patents [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 5 years |
Gross Carrying Amount | $ 386 | 386
AccumulatedAmortization | 379 | 374
Net | 7 | 12
Covenant Not to Compete [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,270 | 1,270
AccumulatedAmortization | 591 | 475
Net | $ 679 | 795
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 | 3,284 | 1,288
Net | $ 28,376 | 30,372
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 | 43 | 10
Net | $ 524 | 557
Trade Names [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 2 years |
Gross Carrying Amount | $ 30 | 30
AccumulatedAmortization | 30 | 30
Net | $ 0 | $ 0

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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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