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DEBT - 2024 Senior Notes (Detail) - 5.625% Senior Notes due 2024, unsecured - Senior Notes - USD ($)
6 Months Ended
Jun. 30, 2018
Mar. 05, 2014
Debt Instrument [Line Items]    
Senior Notes issued amount   $ 350,000,000
Stated interest rate of senior notes 5.625% 5.625%
Redemption price (as a percent) 100.00%