Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v2.4.1.9
Subsequent Events - Additional Information (Detail) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Apr. 23, 2015
Subsequent Event [Line Items]      
Dividends declared per share $ 0.10us-gaap_CommonStockDividendsPerShareDeclared $ 0.10us-gaap_CommonStockDividendsPerShareDeclared  
Dividends declared, date Apr. 23, 2015    
Dividends declared, payable date May 29, 2015    
Dividends declared, record date May 15, 2015    
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Dividends declared per share     $ 0.10us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember