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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets and Goodwill | The following table shows an analysis of goodwill and other intangible assets:
|  | Goodwill and other intangible assets |
|  | Goodwill |  | Other intangible assets |  | Total |
| Balance as of December 31, 2015 |  |  |  |  |  |
| Gross amount | $ | 199,889 |  |  | $ | 96,599 |  |  | $ | 296,488 |  |
| Accumulated impairment losses and amortization | (2,299 | ) |  | (29,035 | ) |  | (31,334 | ) |
|  | 197,590 |  |  | 67,564 |  |  | 265,154 |  |
| Amortization | — |  |  | (13,968 | ) |  | (13,968 | ) |
| Balance as of December 31, 2016 |  |  |  |  |  |
| Gross amount | 199,889 |  |  | 96,599 |  |  | 296,488 |  |
| Accumulated impairment losses and amortization | (2,299 | ) |  | (43,003 | ) |  | (45,302 | ) |
|  | 197,590 |  |  | 53,596 |  |  | 251,186 |  |
| Amortization | — |  |  | (8,041 | ) |  | (8,041 | ) |
| Balance as of December 31, 2017 |  |  |  |  |  |
| Gross amount | 199,889 |  |  | 96,599 |  |  | 296,488 |  |
| Accumulated impairment losses and amortization | (2,299 | ) |  | (51,044 | ) |  | (53,343 | ) |
|  | $ | 197,590 |  |  | $ | 45,555 |  |  | $ | 243,145 |  |
Schedule of Goodwill and Other Intangible Assets Included In Equity Method Investments | The following table shows an analysis of goodwill and other intangible assets included in investments in other ventures, under equity method:
|  | Goodwill and other intangible assets included in investments in other ventures, under equity method |
|  | Goodwill |  | Other intangible assets |  | Total |
| Balance as of December 31, 2015 |  |  |  |  |  |
| Gross amount | $ | 12,318 |  |  | $ | 51,796 |  |  | $ | 64,114 |  |
| Accumulated impairment losses and amortization | (4,500 | ) |  | (36,460 | ) |  | (40,960 | ) |
|  | 7,818 |  |  | 15,336 |  |  | 23,154 |  |
| Amortization | — |  |  | (3,474 | ) |  | (3,474 | ) |
| Balance as of December 31, 2016 |  |  |  |  |  |
| Gross amount | 12,318 |  |  | 51,796 |  |  | 64,114 |  |
| Accumulated impairment losses and amortization | (4,500 | ) |  | (39,934 | ) |  | (44,434 | ) |
|  | 7,818 |  |  | 11,862 |  |  | 19,680 |  |
| Amortization | — |  |  | (2,946 | ) |  | (2,946 | ) |
| Balance as of December 31, 2017 |  |  |  |  |  |
| Gross amount | 12,318 |  |  | 51,796 |  |  | 64,114 |  |
| Accumulated impairment losses and amortization | (4,500 | ) |  | (42,880 | ) |  | (47,380 | ) |
|  | $ | 7,818 |  |  | $ | 8,916 |  |  | $ | 16,734 |  |
Schedule of Other Intangible Assets By Major Class | The gross carrying value and accumulated amortization by major category of other intangible assets is shown below:
|  | Other intangible assets |
| At December 31, 2017 | Gross carrying value |  | Accumulated amortization and impairment losses |  | Total |
| Customer relationships and customer lists | $ | 95,458 |  |  | $ | (51,633 | ) |  | $ | 43,825 |  |
| Value of business acquired | 20,200 |  |  | (20,200 | ) |  | — |  |
| Software | 12,230 |  |  | (12,230 | ) |  | — |  |
| Licenses | 10,267 |  |  | — |  |  | 10,267 |  |
| Patents and intellectual property | 4,500 |  |  | (4,500 | ) |  | — |  |
| Covenants not-to-compete | 4,030 |  |  | (4,030 | ) |  | — |  |
| Trademarks and trade names | 1,710 |  |  | (1,331 | ) |  | 379 |  |
|  | $ | 148,395 |  |  | $ | (93,924 | ) |  | $ | 54,471 |  |
|  | Other intangible assets |
| At December 31, 2016 | Gross carrying value |  | Accumulated amortization and impairment losses |  | Total |
| Customer relationships and customer lists | $ | 95,458 |  |  | $ | (42,142 | ) |  | $ | 53,316 |  |
| Value of business acquired | 20,200 |  |  | (19,527 | ) |  | 673 |  |
| Software | 12,230 |  |  | (11,938 | ) |  | 292 |  |
| Licenses | 10,267 |  |  | — |  |  | 10,267 |  |
| Patents and intellectual property | 4,500 |  |  | (4,500 | ) |  | — |  |
| Covenants not-to-compete | 4,030 |  |  | (3,523 | ) |  | 507 |  |
| Trademarks and trade names | 1,710 |  |  | (1,307 | ) |  | 403 |  |
|  | $ | 148,395 |  |  | $ | (82,937 | ) |  | $ | 65,458 |  |
Schedule of Expected Amortization Expense | Expected amortization of the other intangible assets, including other intangible assets recorded in investments in other ventures, under equity method, is shown below:
|  | Other intangibles |  | Other intangible assets included in investments in other ventures, under equity method |  | Total |
| 2018 | $ | 5,727 |  |  | $ | 2,596 |  |  | $ | 8,323 |  |
| 2019 | 5,446 |  |  | 2,427 |  |  | 7,873 |  |
| 2020 | 5,237 |  |  | 1,564 |  |  | 6,801 |  |
| 2021 | 4,910 |  |  | 702 |  |  | 5,612 |  |
| 2022 | 4,522 |  |  | 702 |  |  | 5,224 |  |
| 2023 and thereafter | 9,446 |  |  | 925 |  |  | 10,371 |  |
| Total remaining amortization expense | 35,288 |  |  | 8,916 |  |  | 44,204 |  |
| Indefinite lived | 10,267 |  |  | — |  |  | 10,267 |  |
| Total | $ | 45,555 |  |  | $ | 8,916 |  |  | $ | 54,471 |  |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + 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) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + 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) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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