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DEBT - 2021 Senior Notes (Detail) - 5.25% Senior Notes due 2021, unsecured - Senior Notes - USD ($)
9 Months Ended
Apr. 16, 2013
Sep. 30, 2018
Debt Instrument [Line Items]    
Senior Notes issued amount $ 550,000,000  
Stated interest rate 5.25% 5.25%
Redemption price (as a percent) 101.00% 102.625%