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Reconciliation of Beginning and Ending Balances of Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) - Fair Value Measurements, Level 3 - Fair Value Measurements, Recurring
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning Balance $ (22,469)
Change in fair value (3,431)
Ending Balance $ (25,900)