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Reconciliation of Beginning and Ending Balance for Liabilities Measured at Fair Value on Recurring Basis Unobservable Inputs (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Fair Value Disclosures [Abstract]  
Beginning balances - Liabilities $ 0
Interest rate swaps effective December 31, 2018 5,093
Ending balances - Liabilities $ 5,093