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Fair Value - Change in Fair Value for All Assets and Liabilities Using Unobservable Level 3 Inputs As Determined By Level 3 Inputs (Detail) - Fair Value, Inputs, Level 3 [Member]
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 23,500
Change in fair value 856
Current portion 13,300
Long-term portion 11,056
Ending balance $ 24,356