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Schedule of Borrowings and Repayments Under Credit Facility (Detail) - Unsecured Credit Facility
$ in Thousands
4 Months Ended
Apr. 22, 2017
USD ($)
Debt Instrument [Line Items]  
Balance at December 31, 2016 $ 24,000
Borrowings 230,100
Payments (237,800)
Balance at April 22, 2017 $ 16,300