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Schedule of Borrowings and Repayments Under Credit Facility (Detail) - Unsecured Credit Facility
$ in Thousands
6 Months Ended
Jul. 15, 2017
USD ($)
Debt Instrument [Line Items]  
Balance at December 31, 2016 $ 24,000
Borrowings 347,900
Payments (368,500)
Balance at July 15, 2017 $ 3,400