Basis of Presentation	12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	2. Basis of Presentation Principles of Consolidation The Company conducts its business through limited liability companies and C-corporations, each of which is a direct or indirect wholly owned subsidiary of the Company. The accompanying consolidated financial statements include the accounts of the Company, its wholly owned subsidiaries, the accounts of variable interest entities (“VIEs”) in which the Company is the primary beneficiary, and certain professional groups through rights granted to the Company by contract to manage and control the business of such professional groups. All intercompany transactions and balances have been eliminated in consolidation. The Private Share Exchange (defined below) between the Company and AAC’s stockholders (as discussed in Note 3) was accounted for similar to a common control transaction resulting in the assets, liabilities, and equity of AAC being carried over at their historical bases. At the time of the Private Share Exchange, Holdings was a shell company that had not conducted any business and had no material assets or liabilities. As such, the historical financial statements presented for periods prior to the Private Share Exchange represent the historical results of operations of AAC. During the year ended December 31, 2014, the Company consolidated one real estate VIE, Behavioral Healthcare Realty, LLC (“BHR”) through April 15, 2014, at which point BHR was acquired by the Company and became a wholly owned subsidiary of the Company (see Note 3 for further discussion). At the time of the BHR Acquisition, BHR leased two treatment facilities to the Company under long-term triple net leases and was renovating and constructing additional treatment facilities that it planned to lease to the Company. The Company was the primary beneficiary as a result of its guarantee of BHR’s debt prior to the BHR Acquisition. The Company also consolidated five professional groups (“Professional Groups”) that constituted VIEs as of December 31, 2014 and six Professional Groups that constituted VIEs as of December 31, 2015. The Professional Groups are responsible for the supervision and delivery of medical services to the Company’s clients. The Company provides management services to the Professional Groups. Based on the Company’s ability to direct the activities that most significantly impact the economic performance of the Professional Groups, provide necessary funding to the Professional Groups and the obligation and likelihood of absorbing all expected gains and losses of the Professional Groups, the Company has determined that it is the primary beneficiary of these Professional Groups. The accompanying consolidated balance sheets as of December 31, 2014 and 2015 include assets of $0.5 million and $1.4 million, respectively, and liabilities of $3.3 million and $0.6 million, respectively, related to the VIEs. The accompanying consolidated income statements include net (income) loss attributable to noncontrolling interest of $(0.7) million, $1.2 million and $2.8 million related to the VIEs for the years ended December 31, 2013, 2014 and 2015, respectively. The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates.

2. Basis of Presentation

Principles of Consolidation

The Company conducts its business through limited liability companies and C-corporations, each of which is a direct or indirect wholly owned subsidiary of the Company. The accompanying consolidated financial statements include the accounts of the Company, its wholly owned subsidiaries, the accounts of variable interest entities (“VIEs”) in which the Company is the primary beneficiary, and certain professional groups through rights granted to the Company by contract to manage and control the business of such professional groups. All intercompany transactions and balances have been eliminated in consolidation.

The Private Share Exchange (defined below) between the Company and AAC’s stockholders (as discussed in Note 3) was accounted for similar to a common control transaction resulting in the assets, liabilities, and equity of AAC being carried over at their historical bases. At the time of the Private Share Exchange, Holdings was a shell company that had not conducted any business and had no material assets or liabilities. As such, the historical financial statements presented for periods prior to the Private Share Exchange represent the historical results of operations of AAC.

During the year ended December 31, 2014, the Company consolidated one real estate VIE, Behavioral Healthcare Realty, LLC (“BHR”) through April 15, 2014, at which point BHR was acquired by the Company and became a wholly owned subsidiary of the Company (see Note 3 for further discussion). At the time of the BHR Acquisition, BHR leased two treatment facilities to the Company under long-term triple net leases and was renovating and constructing additional treatment facilities that it planned to lease to the Company. The Company was the primary beneficiary as a result of its guarantee of BHR’s debt prior to the BHR Acquisition. The Company also consolidated five professional groups (“Professional Groups”) that constituted VIEs as of December 31, 2014 and six Professional Groups that constituted VIEs as of December 31, 2015. The Professional Groups are responsible for the supervision and delivery of medical services to the Company’s clients. The Company provides management services to the Professional Groups. Based on the Company’s ability to direct the activities that most significantly impact the economic performance of the Professional Groups, provide necessary funding to the Professional Groups and the obligation and likelihood of absorbing all expected gains and losses of the Professional Groups, the Company has determined that it is the primary beneficiary of these Professional Groups.

The accompanying consolidated balance sheets as of December 31, 2014 and 2015 include assets of $0.5 million and $1.4 million, respectively, and liabilities of $3.3 million and $0.6 million, respectively, related to the VIEs. The accompanying consolidated income statements include net (income) loss attributable to noncontrolling interest of $(0.7) million, $1.2 million and $2.8 million related to the VIEs for the years ended December 31, 2013, 2014 and 2015, respectively.

The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”). The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates.