Annual report pursuant to Section 13 and 15(d)

Subsequent event - Additional Information (Detail)

v2.4.0.6
Subsequent event - Additional Information (Detail) (Subsequent Event [Member], USD $)
In Millions, unless otherwise specified
1 Months Ended
Mar. 18, 2013
Subsequent Event [Member]
 
Subsequent Event [Line Items]  
Stock repurchase program authorized amount $ 150