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Long-Term Debt - Carrying Value of Long Term Debt Instruments (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2018
5.375% Senior notes [Member]  
Disclosure of detailed information about borrowings [Line Items]  
Number of basis points 0.40%
3.527% Senior notes [Member]  
Disclosure of detailed information about borrowings [Line Items]  
Number of basis points 0.20%
4.150% Senior notes [Member]  
Disclosure of detailed information about borrowings [Line Items]  
Number of basis points 0.35%
4.90% Senior notes [Member]  
Disclosure of detailed information about borrowings [Line Items]  
Number of basis points 0.35%