Amount remaining of a stock repurchase plan authorized.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Stockholders' Equity - Additional Information (Detail) - USD ($)	Sep. 30, 2020	Nov. 06, 2015	Nov. 05, 2014
Stockholders Equity [Line Items]
Remaining amount available for repurchases of shares	$ 25,300,000
Accelerated Share Repurchase Program [Member]
Stockholders Equity [Line Items]
Maximum payments for repurchase of common stock		$ 20,000,000.0	$ 30,000,000.0