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Fair Value Measurements (Schedule of Fair Value of Assets and Liabilities not Subject to Fair Value Recognition) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Assets    
Notes Receivable, Fair Value Disclosure $ 700 $ 57,300
Assets, Fair Value Disclosure   493,879
Liabilities:    
Notes Payable, Carrying Value   27,250
December 2021 Notes [Member]    
Liabilities:    
Notes Payable, Carrying Value   16,950
December 2024 Notes [Member]    
Liabilities:    
Notes Payable, Carrying Value   10,300
Wellstat Note Receivable [Member]    
Assets    
Notes receivable, Carrying Value   50,191
Hyperion [Member]    
Assets    
Notes receivable, Carrying Value   1,200
CareView [Member]    
Assets    
Notes receivable, Carrying Value   690
Fair Value Level 2 [Member]    
Assets    
Assets, Fair Value Disclosure   14,152
Liabilities:    
Notes payable, Fair Value   33,931
Fair Value Level 2 [Member] | December 2021 Notes [Member]    
Liabilities:    
Notes payable, Fair Value   20,978
Fair Value Level 2 [Member] | December 2024 Notes [Member]    
Liabilities:    
Notes payable, Fair Value   12,953
Fair Value Level 2 [Member] | Wellstat Note Receivable [Member]    
Assets    
Notes Receivable, Fair Value Disclosure   0
Fair Value Level 2 [Member] | Hyperion [Member]    
Assets    
Notes Receivable, Fair Value Disclosure   0
Fair Value Level 2 [Member] | CareView [Member]    
Assets    
Notes Receivable, Fair Value Disclosure   0
Fair Value Level 3 [Member]    
Assets    
Notes Receivable, Fair Value Disclosure   57,279
Assets, Fair Value Disclosure   266,196
Liabilities:    
Notes payable, Fair Value   0
Fair Value Level 3 [Member] | December 2021 Notes [Member]    
Liabilities:    
Notes payable, Fair Value   0
Fair Value Level 3 [Member] | December 2024 Notes [Member]    
Liabilities:    
Notes payable, Fair Value   0
Fair Value Level 3 [Member] | Wellstat Note Receivable [Member]    
Assets    
Notes Receivable, Fair Value Disclosure   55,389
Fair Value Level 3 [Member] | Hyperion [Member]    
Assets    
Notes Receivable, Fair Value Disclosure   1,200
Fair Value Level 3 [Member] | CareView [Member]    
Assets    
Notes Receivable, Fair Value Disclosure   690
Assets [Member]    
Assets    
Assets, Fair Value Disclosure   52,081
Assets [Member] | Fair Value Level 2 [Member]    
Assets    
Notes Receivable, Fair Value Disclosure   $ 0