Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Schedule of Repurchase Agreements (Parenthetical) (Details)

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Stockholders' Equity - Schedule of Repurchase Agreements (Parenthetical) (Details) - USD ($)
shares in Thousands
 1 Months Ended 9 Months Ended
Oct. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Aug. 31, 2015
Dec. 31, 2014
Aug. 31, 2014
May. 31, 2014
Class Of Stock [Line Items]              
Treasury stock   $ 25,104,000     $ 26,034,000    
Common Stock [Member]              
Class Of Stock [Line Items]              
Stock repurchase program, authorized amount       $ 2,000,000,000      
Common stock shares retired   433,276          
Common Stock [Member] | May 2014 ASR Agreement [Member]              
Class Of Stock [Line Items]              
Stock repurchase program, authorized amount             $ 600,000,000
Common stock shares retired     151,846        
Stock repurchase program, unused portion of authorized amount     $ 93,596,000        
Common Stock [Member] | August 2014 ASR Agreement [Member]              
Class Of Stock [Line Items]              
Stock repurchase program, authorized amount           $ 250,000,000  
Number of shares repurchased and retired 19,432   51,885