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Goodwill and intangible assets (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Indefinite-lived Intangible Assets [Line Items] |  |
GrossCarryingAmount | $ 34,913 | $ 4,686
AccumulatedAmortization | 2,494 | 1,387
Net | $ 32,419 | 3,299
Licenses [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 10 years |
GrossCarryingAmount | $ 1,000 | 1,000
AccumulatedAmortization | 317 | 217
Net | $ 683 | 783
Patents [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 5 years |
GrossCarryingAmount | $ 386 | 386
AccumulatedAmortization | 374 | 366
Net | 12 | 20
Covenant Not to Compete [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
GrossCarryingAmount | 1,270 | 1,270
AccumulatedAmortization | 475 | 322
Net | $ 795 | 948
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] |  |
GrossCarryingAmount | $ 31,660 | 2,000
AccumulatedAmortization | 1,288 | 452
Net | $ 30,372 | 1,548
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) | 3 years |
Above Market Leases [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 13 years |
GrossCarryingAmount | $ 567 | 0
AccumulatedAmortization | 10 | 0
Net | $ 557 | 0
Trade Names [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Amortization Period(in years) | 2 years |
GrossCarryingAmount | $ 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://www.xbrl.org/2003/role/presentationRef -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/presentationRef -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 after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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