Earnings Per Common Share - Additional Information (Detail) (Share Options and Other Stock Awards [Member]) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014
Share Options and Other Stock Awards [Member]
Earnings Per Common Share [Line Items]
Weighted average common shares outstanding	7

Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

No definition available.

Name:	us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration