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	6 Months Ended
	Jun. 30, 2016 USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 23,500
Change in fair value	1,800
Current portion	12,500
Long-term portion	12,800
Ending balance	$ 25,300