Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v2.4.0.8
Subsequent Events - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jul. 24, 2014
Subsequent Event [Member]
Subsequent Event [Line Items]          
Dividends declared per share $ 0.10 $ 0.10 $ 0.20 $ 0.20 $ 0.10
Dividends declared, date     Jul. 24, 2014    
Dividends declared, payable date     Aug. 25, 2014    
Dividends declared, record date     Aug. 11, 2014