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Earnings per Share - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Jun. 25, 2014
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Jun. 25, 2014
Mar. 31, 2014
5.25% Convertible Notes Due March 15, 2014 [Member]
Sep. 30, 2014
5.25% Convertible Notes Due March 15, 2014 [Member]
Sep. 30, 2014
Equity Unit Purchase Agreements [Member]
Sep. 30, 2013
Equity Unit Purchase Agreements [Member]
Sep. 30, 2014
Stock Option [Member]
Sep. 30, 2013
Stock Option [Member]
Sep. 30, 2013
Convertible Notes [Member]
Sep. 30, 2014
Convertible Notes [Member]
Sep. 30, 2013
Convertible Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                              
Number of shares, option exercised             89,000,000                
Number of shares that become outstanding   1,177,672,033   1,177,672,033       89,000,000              
Number of weighted average outstanding shares included in both basic and diluted shares               67,000,000              
Weighted Average number of shares outstanding dilutive effect   8,000,000   6,000,000 1,000,000     89,000,000              
Number of weighted average outstanding diluted shares   1,205,000,000 1,079,000,000 1,170,000,000 1,079,000,000     22,000,000              
Number of anti-dilutive securities                 3,000,000 48,000,000     89,000,000 22,000,000 89,000,000
Weighted average exercise price of options                     $ 16.24 $ 10.78      
Number of common stock shares issued in a part of acquisition 36,523,010                            
Business acquisition common stock issued, price per share           $ 13.69