Regulatory and Legal Developments - Additional Information (Detail)	12 Months Ended
Dec. 31, 2013 Plaintiff
Legal Proceedings And Contingencies [Line Items]
Number Of Plaintiffs	8

Number of plaintiffs that have filed claims pertaining to a loss contingency.

No definition available.

Name:	us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration