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Aggregate Consolidated Scheduled Debt Repayment (Parenthetical) (Detail) - USD ($)
Dec. 31, 2016
May 31, 2016
Dec. 31, 2015
Schedule Of Equity Method Investments [Line Items]      
Line of credit borrowings $ 201,500,000   $ 142,150,000
Outstanding borrowing   $ 250,000,000  
New Revolving Credit Facility Agreement      
Schedule Of Equity Method Investments [Line Items]      
Outstanding borrowing $ 250,000,000