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Goodwill and Other Intangible Assets, Net of Accumulated Amortization - Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2018 | Dec. 31, 2017
Schedule of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items] |  |
Below market leases, Gross Amount | $ 15 | $ 15
Definite life, Accumulated Amortization | (11,458) | (9,934)
Below market leases, Accumulated Amortization | (14) | (13)
Below market leases. Net Carrying Amount | $ 1 | $ 2
Definite life, Weighted- Average Remaining Life (Years) | 4 years 7 months 6 days | 5 years
Gross Amount | $ 37,354 | $ 34,855
Net Carrying Amount | 25,896 | 24,921
Trademark and Trade Names [Member] |  |
Schedule of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items] |  |
Definite life, Gross Amount | 7,061 | 7,061
Definite life, Accumulated Amortization | (6,183) | (6,030)
Definite life, Net Carrying Amount | $ 878 | $ 1,031
Definite life, Weighted- Average Remaining Life (Years) | 1 month 6 days | 2 months 12 days
Non-contractual Customers [Member] |  |
Schedule of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items] |  |
Definite life, Gross Amount | $ 10,447 | $ 7,950
Definite life, Accumulated Amortization | (2,407) | (1,495)
Definite life, Net Carrying Amount | $ 8,040 | $ 6,455
Definite life, Weighted- Average Remaining Life (Years) | 2 years 6 months | 2 years 6 months
License Agreements (GSE) [Member] |  |
Schedule of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items] |  |
Definite life, Gross Amount | $ 4,981 | $ 4,981
Definite life, Accumulated Amortization | (1,548) | (1,298)
Definite life, Net Carrying Amount | $ 3,433 | $ 3,683
Definite life, Weighted- Average Remaining Life (Years) | 8 months 12 days | 10 months 24 days
Non-compete Agreements [Member] |  |
Schedule of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items] |  |
Definite life, Gross Amount | $ 3,608 | $ 3,606
Definite life, Accumulated Amortization | (642) | (496)
Definite life, Net Carrying Amount | $ 2,966 | $ 3,110
Definite life, Weighted- Average Remaining Life (Years) | 1 year 1 month 6 days | 1 year 2 months 12 days
Contractual Customers [Member] |  |
Schedule of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items] |  |
Definite life, Gross Amount | $ 1,452 | $ 1,452
Definite life, Accumulated Amortization | (664) | (602)
Definite life, Net Carrying Amount | $ 788 | $ 850
Definite life, Weighted- Average Remaining Life (Years) | 2 months 12 days | 2 months 12 days
Trademark and Trade Names [Member] |  |
Schedule of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items] |  |
Indefinite life, intangible assets | $ 4,400 | $ 4,400
License Agreements (GSE) [Member] |  |
Schedule of Acquired Finite And Indefinite Lived Intangible Asset By Major Class [Line Items] |  |
Indefinite life, intangible assets | $ 5,390 | $ 5,390

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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