Subsequent Event - Additional Information (Detail) - Subsequent Event	Feb. 16, 2016 USD ($)
Subsequent Event [Line Items]
Share repurchase program, authorized amount	2 years
Share repurchase program, ending period	Feb. 16, 2018
Maximum [Member]
Subsequent Event [Line Items]
Share repurchase program, authorized amount	$ 400,000,000

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