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Aggregate Consolidated Scheduled Debt Repayment (Parenthetical) (Detail) - USD ($)
Dec. 31, 2015
Mar. 27, 2015
Dec. 31, 2014
Schedule Of Equity Method Investments [Line Items]      
Line of credit borrowings $ 142,150,000   $ 89,750,000
New Revolving Credit Facility Agreement      
Schedule Of Equity Method Investments [Line Items]      
Outstanding borrowing $ 185,000,000 $ 185,000,000