Summary of Equity Investments and Ownership Interests (Detail)	Jun. 30, 2016	Dec. 31, 2015
Summit Medical Center | Edmond OK
Investments In And Advances To Affiliates [Line Items]
Equity investments, ownership interest	0.00%	8.00%
Foundation Surgery Affiliate of Nacogdoches LLP | Nacogdoches TX
Investments In And Advances To Affiliates [Line Items]
Equity investments, ownership interest	13.00%	13.00%
Park Ten Surgery Center | Houston TX
Investments In And Advances To Affiliates [Line Items]
Equity investments, ownership interest	10.00%	10.00%
Foundation Surgery Affiliate of Middleburg Heights LLC | Middleburg Heights OH
Investments In And Advances To Affiliates [Line Items]
Equity investments, ownership interest	10.00%	10.00%
Foundation Surgery Affiliate of Huntingdon Valley LP | Huntingdon Valley PA
Investments In And Advances To Affiliates [Line Items]
Equity investments, ownership interest	20.00%	20.00%
New Jersey Surgery Center LLC | Mercerville NJ
Investments In And Advances To Affiliates [Line Items]
Equity investments, ownership interest	10.00%	10.00%
Foundation Surgery Affiliate of Northwest Oklahoma City LLC | Oklahoma City OK
Investments In And Advances To Affiliates [Line Items]
Equity investments, ownership interest	20.00%	20.00%
Cumberland Valley Surgery Center LLC | Hagerstown MD
Investments In And Advances To Affiliates [Line Items]
Equity investments, ownership interest	34.00%	34.00%
Frederick Surgical Center LLC | Frederick MD
Investments In And Advances To Affiliates [Line Items]
Equity investments, ownership interest	20.00%	20.00%