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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Loss Contingencies [Line Items] |  |  |
Total remaining draws on construction loans committed to fund | $ 437,000 |  | $ 244,000
Rent expense | 10,200 | $ 9,800 |
Business acquisition, contingent cash consideration | 15,971 |  | $ 17,207
Long-term Debt Payable to Related Parties [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Business acquisition, contingent cash consideration | $ 12,400 |  |

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