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Schedule of Borrowings and Repayments Under Credit Facility (Detail) - Unsecured Credit Facility
$ in Thousands
9 Months Ended
Oct. 07, 2017
USD ($)
Debt Instrument [Line Items]  
Balance at December 31, 2016 $ 24,000
Borrowings 421,200
Payments (438,700)
Balance at October 7, 2017 $ 6,500