Performance Awards - Additional Information (Detail)	12 Months Ended
Dec. 31, 2015
2014 EIP \| Performance Awards
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Performance period	3 years

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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