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Equity and Accumulated Other Comprehensive Income - Additional Information (Detail) - USD ($)
$ in Billions
1 Months Ended 9 Months Ended
Feb. 28, 2018
Sep. 30, 2018
Stockholders' Equity Note [Abstract]    
Number of shares repurchased during period   0
Stock repurchase program, number of shares authorized to be repurchased   100,000,000
Number of common shares issued from treasury stock   3,500,000
Straight Path Communications Inc.    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Number of shares issued related to business acquisition 49,000,000  
Equity issued related to business acquisition $ 2.4