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Goodwill and Intangible Assets (Detail) - (Table 3) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |  |
2012 (remaining nine months) |  | $ 4,621 |
2013 |  | 4,547 |
2014 |  | 3,721 |
2015 |  | 2,095 |
2016 |  | 1,563 |
Thereafter |  | 10,870 |
Total |  | 27,417 |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | $ 3,045 | 4,045 |
Customer Lists [Member] |  |  |
Goodwill [Line Items] |  |  |
Cost basis |  | 47,019 | $ 41,509
Accumulated amortization |  | 24,127 | 21,341
Net carrying amount |  | 22,892 | 20,168
Licensing Agreements [Member] |  |  |
Goodwill [Line Items] |  |  |
Cost basis |  | 5,600 | 5,600
Accumulated amortization |  | 5,600 | 5,600
Net carrying amount |  | 0 | 0
Noncompete Agreements [Member] |  |  |
Goodwill [Line Items] |  |  |
Cost basis |  | 2,440 | 2,440
Accumulated amortization |  | 2,375 | 2,426
Net carrying amount |  | 65 | 14
Contractual Rights [Member] |  |  |
Goodwill [Line Items] |  |  |
Cost basis |  | 4,200 | 4,200
Accumulated amortization |  | 4,200 | 4,200
Net carrying amount |  | 0 | 0
Other Intangible Assets [Member] |  |  |
Goodwill [Line Items] |  |  |
Cost basis |  | 14 | 14
Accumulated amortization |  | 14 | 14
Net carrying amount |  | 0 | 0
Total [Member] |  |  |
Goodwill [Line Items] |  |  |
Cost basis |  | 68,493 | 58,353
Accumulated amortization |  | 41,076 | 36,916
Net carrying amount |  | 27,417 | 21,437
Trademarks [Member] |  |  |
Goodwill [Line Items] |  |  |
Cost basis |  | 100,333 | 100,333
Accumulated amortization |  | 0 | 0
Net carrying amount |  | $ 96,288 | $ 97,288

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