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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands, shares in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Loss Contingencies [Line Items] |  |
Business acquisition, contingent cash consideration | $ 27,195 | $ 28,099
Acquisitions from 2014 through 2019 [Member] |  |
Loss Contingencies [Line Items] |  |
Business acquisition, contingent cash consideration | $ 22,700 |
Business acquisition, contingent consideration limited partnership units | 1.4 |
Construction Loans [Member] |  |
Loss Contingencies [Line Items] |  |
Total remaining draws on construction loans committed to fund | $ 694,000 | $ 294,000

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