Stock Repurchase Program - Additional Information (Detail) shares in Millions	Mar. 31, 2019 shares
Class of Stock Disclosures [Abstract]
Stock repurchase program, repurchase authorization	5.0
Stock repurchase program, remaining number of shares authorized to be repurchased	3.6

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant