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DEBT - 2023 Senior Notes (Detail) - 5.875% Senior Notes due 2023, unsecured - Unsecured Debt - USD ($)
6 Months Ended
Jun. 30, 2018
Apr. 16, 2015
Debt Instrument [Line Items]    
Senior Notes issued amount   $ 350,000,000
Stated interest rate of senior notes   5.875%
Redemption price (as a percent) 100.00%