Fair Value Measurements (Schedule Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Level 3, beginning of period, Financial Assets	$ 475
Level 3, beginning of period, Contingent Liability	0
Acquisition/Purchases/capital funding	3,219
Acquisition, Contingent Liability	6,000
Unrealized (loss) gain included in net income	161
Distributions	(53)
Level 3, end of period, Financial Assets	8,802
Level 3, end of period, Contingent Liability	6,000
Equity Method Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Level 3, beginning of period, Financial Assets	475
Acquisition/Purchases/capital funding	3,219
Unrealized (loss) gain included in net income	(170)
Distributions	(53)
Level 3, end of period, Financial Assets	3,471
Contingent Asset [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Level 3, beginning of period, Financial Assets	0
Acquisition/Purchases/capital funding	5,000
Unrealized (loss) gain included in net income	331
Level 3, end of period, Financial Assets	$ 5,331