Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v2.4.0.6
Subsequent Events - Additional Information (Detail) (Dividend Declared, USD $)
6 Months Ended
Jun. 30, 2012
Dividend Declared
 
Subsequent Event [Line Items]  
Dividends declared date Jul. 17, 2012
Cash dividend $ 0.72
Dividends payable date Sep. 20, 2012
Dividends record date Sep. 10, 2012