Capital Stock - Additional Information (Detail)	Jun. 18, 2013 Maximum	Jun. 30, 2013 2012 Program
Class of Stock [Line Items]
Common stock available for sale		10,000,000
Common stock share authorized to repurchase	10,000,000

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant