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Fair Value Disclosures - Schedule of Roll-forward of Fair Value of Level 3 Instruments (Detail) - Level 3 [Member]
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Balance at beginning of period $ 106,000
Amounts acquired or issued 171,942
Net change in fair value (10,674)
Settlements 0
Transfers in and/or out of Level 3 0
Balance at end of period $ 267,268