Subsequent Events - Additional Information (Detail) (Subsequent Event [Member], USD $)	Jun. 30, 2013
Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock price per share	$ 40.50

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

No definition available.

Name:	us-gaap_BusinessAcquisitionSharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant