Subsequent Events - Additional Information (Detail) - USD ($)	12 Months Ended
Dec. 31, 2015	Feb. 29, 2016
Subsequent Event [Line Items]
Share repurchase program, termination date	Dec. 31, 2016
Maximum [Member] \| Common Stock [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Share repurchase program, authorized amount		$ 25,000,000

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