Subsequent Event - Additional Information (Detail) - Common Stock [Member] - Subsequent Event [Member]	1 Months Ended
Jan. 31, 2020 shares
Subsequent Event [Line Items]
Percentage of current outstanding shares under stock repurchase program	5.00%
Maximum [Member]
Subsequent Event [Line Items]
Number of shares repurchased under stock repurchase program	109,725,000

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration