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Acquisition of Businesses - Additional Information (Detail) (USD $) | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  | 6 Months Ended
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May 31, 2012 Clinic | Jun. 30, 2013 Clinic | Dec. 31, 2012 Clinic Transactions | Feb. 28, 2013 | May 22, 2012 | May 22, 2012 Seller Note [Member] | Feb. 28, 2013 February 2015 [Member] | Feb. 28, 2013 February 2016 [Member] | Apr. 30, 2013 April 2014 [Member] | Apr. 30, 2013 April 2015 [Member] | May 31, 2013 May 2014 [Member] | May 31, 2012 May 2014 [Member] | May 31, 2013 May 2015 [Member] | May 31, 2012 May 2013 [Member] | Jun. 30, 2013 Non Competition Agreement [Member] | Jun. 30, 2013 Referral relationships [Member] | Dec. 31, 2012 Multi Clinic [Member] | Jun. 30, 2013 Multi Clinic [Member] Non Competition Agreement [Member] | Dec. 31, 2012 Multi Clinic [Member] Non Competition Agreement [Member] | Jun. 30, 2013 February 2013 Acquisition [Member] Installment Clinic | Jun. 30, 2013 April 2013 Acquisition [Member] Clinic Installment | Jun. 30, 2013 May 2013 Acquisition [Member] Clinic Installment
Loans At Acquisition Date [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of purchase of non controlling interest |  | 100.00% |  | 100.00% | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72.00% | 50.00% | 80.00%
Cash paid for acquisition of interest in clinic |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,090,000 |  |  | $ 1,938,000 |  |  | $ 4,300,000 | $ 2,400,000 | $ 3,600,000
Business acquisition number of installments to payment of purchase consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 | 2
Business acquisition, cost of acquired entity |  | 95,000 |  | 5,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition cost payable in two principal installments including accrued interest |  |  |  |  |  |  | 200,000 |  | 100,000 | 100,000 | 100,000 | 125,000 | 100,000 | 125,000 |  |  |  |  |  |  |  |
Seller notes issued for acquisition of interest in clinic |  |  | 350,000 | 800,000 | 250,000 |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of clinics |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 | 5 | 5
Percentage of Tax Deductible Goodwill |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest seller note |  |  |  |  |  | 3.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tradenames |  | 1,300,000 | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocated to referral relationships |  | 800,000 | 857,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 57,000 |  |  |  |  |
Purchase price allocated to non-competition agreement |  |  | 265,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 240,000 | 25,000 |  |  |
Values assigned being amortized to expense equally over the respective estimated life |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years | 12 years |  |  |  |  |  |
Number of separate transactions for outpatient therapy practices |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of clinic acquired | 7 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number or transaction for notes payable purchased |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |
Purchase price allocated to current asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43,000 |  |  |  |  |
Purchase price allocated to non current asset |  |  | 478,000 | 719,000 |  |  |  |  |  |  |  |  |  |  |  |  | 213,000 |  |  |  |  |
Purchase price allocated to goodwill |  |  | $ 8,198,000 | $ 14,400,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,883,000 |  |  |  |  |

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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Amount of tangible or intangible assets, including a business or subsidiary of the acquirer transferred by the entity to the former owners of the acquiree. Excludes cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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