Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Loss Contingencies [Line Items]
Total remaining draws on construction loans committed to fund	$ 1,296,460
Contingent consideration	32,065	$ 28,099
Acquisitions from 2014 through 2018
Loss Contingencies [Line Items]
Contingent consideration	$ 29,300
Business acquisition, contingent cash consideration limited partnership units (in shares)	0.4
Construction Loans
Loss Contingencies [Line Items]
Total remaining draws on construction loans committed to fund	$ 1,500,000	$ 294,000