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Acquisitions - Summary of Components of Purchase Consideration Transferred and Preliminary Allocation of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Assets |  |  |
Goodwill | $ 474,990 | $ 477,532 | $ 412,846
All Acquisitions Other Than Berkeley Point Acquisition [Member] |  |  |
Assets |  |  |
Cash and cash equivalents |  | 3,903 |
Goodwill |  | 64,291 |
Intangibles assets, net |  | 3,188 |
Other assets |  | 9,234 |
Total Assets |  | 80,616 |
Current liabilities |  |  |
Accounts payable, accrued expenses and other liabilities |  | 7,119 |
Total Liabilities |  | 7,119 |
Noncontrolling interest |  | 19,145 |
Net assets acquired |  | $ 54,352 |

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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