Summary of Significant Accounting Policies - Summary of Quantitative Inputs and Assumptions Used for Items Categorized in Level 3 of Fair Value Hierarchy (Detail) - Level 3 [Member] - Discounted Cash Flow [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair Value	$ 119,144
Unobservable Input	Yield
Rate	0.105
Impact to Valuation from an Increase in Input	Decrease