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Assets Measured and Reported at Fair Value on Recurring Basis Using Significant Level 3 Inputs (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2015
USD ($)
Fair Value, Asset Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance at beginning of period $ 30,960
Unrealized gain 1,429
Balance at end of period $ 32,389