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 9 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Oct. 23, 2014
Subsequent Event [Member]
Subsequent Event [Line Items]          
Dividends declared per share $ 0.10 $ 0.10 $ 0.30 $ 0.30 $ 0.10
Dividends declared, date     Oct. 23, 2014    
Dividends declared, payable date     Nov. 24, 2014    
Dividends declared, record date     Nov. 10, 2014