Summary of Cash, Cash Equivalents and Restricted Cash Reported In Condensed Consolidated Statements of Cash Flows (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2020
Minimum
Cash And Cash Equivalents Period Increase Decrease [Line Items]
Short -term cash investments interest rate	0.10%
Maximum
Cash And Cash Equivalents Period Increase Decrease [Line Items]
Short -term cash investments interest rate	0.65%