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General Information - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
segment
$ / shares
Mar. 31, 2015
USD ($)
$ / shares
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2014
USD ($)
General Information Disclosures [Line Items]        
Number of business segments | segment 2      
Common stock shares issued | shares     5,256,053  
Proceeds as a result of the exercise and settlement of employee equity-based awards     $ 24,000,000  
Sale of common stock | shares     54,970,000  
Common stock cash dividend paid per share | $ / shares $ 0.09 $ 0.09    
Common stock cash dividend paid $ 49,000,000 $ 49,000,000    
Common stock dividend declared       $ 0
Underwriters Overallotment Option [Member]        
General Information Disclosures [Line Items]        
Sale of common stock | shares     7,170,000