Basis of Presentation, Description of Business, Significant Accounting Policies and Critical Accounting Estimates - Additional Information (Detail)	12 Months Ended														12 Months Ended
	Dec. 31, 2012 USD ($) State	Dec. 31, 2011 USD ($)	Dec. 31, 2010	Dec. 31, 2012 CAD	Dec. 31, 2012 Indemnification Agreement [Member] CAD	Dec. 31, 2012 Contractual obligations [Member] USD ($)	Dec. 31, 2011 Contractual obligations [Member] USD ($)	Dec. 31, 2012 Reinsured claims losses [Member] USD ($)	Dec. 31, 2011 Reinsured claims losses [Member] USD ($)	Dec. 31, 2012 Senior Credit Facility [Member] USD ($)	Dec. 31, 2012 Old Credit Facility USD ($)	Dec. 31, 2012 Senior subordinated notes [Member] USD ($)	Dec. 31, 2012 Social Services Providers Captive Insurance Company [Member] USD ($)	Dec. 31, 2011 Social Services Providers Captive Insurance Company [Member] USD ($)	Dec. 31, 2012 Provado Insurance Services [Member] USD ($)	Dec. 31, 2011 Provado Insurance Services [Member] USD ($)	Dec. 31, 2012 General and professional liability reinsurance program [Member] Reinsured claims losses [Member] USD ($)	Dec. 31, 2011 General and professional liability reinsurance program [Member] Reinsured claims losses [Member] USD ($)	Dec. 31, 2012 General and professional liability reinsurance program [Member] Social Services Providers Captive Insurance Company [Member] USD ($)	Dec. 31, 2011 Workers' compensation [Member] Reinsured claims losses [Member] USD ($)	Dec. 31, 2012 Workers' compensation [Member] Social Services Providers Captive Insurance Company [Member] USD ($)	Dec. 31, 2012 Collateral for letters of credit [Member] Contractual obligations [Member] USD ($)	Dec. 31, 2011 Collateral for letters of credit [Member] Contractual obligations [Member] USD ($)	Dec. 31, 2012 Collateral for letters of credit [Member] Reinsured claims losses [Member] USD ($)	Dec. 31, 2011 Collateral for letters of credit [Member] Reinsured claims losses [Member] USD ($)	Dec. 31, 2012 Contractual obligations [Member] USD ($)	Dec. 31, 2011 Contractual obligations [Member] USD ($)	Dec. 31, 2012 Auto liability program [Member] Reinsured claims losses [Member] USD ($)	Dec. 31, 2011 Auto liability program [Member] Reinsured claims losses [Member] USD ($)	Dec. 31, 2012 Bank Of Tucson [Member] USD ($)	Dec. 31, 2012 Wells Fargo Bank [Member] USD ($)	Dec. 31, 2012 Fifth Third Bank [Member] USD ($)	Dec. 31, 2012 Bank Of America [Member] USD ($)	Dec. 31, 2012 Non-Interest Bearing Bank [Member] USD ($)
Basis Of Presentation And Significant Accounting Policies [Line Items]
No of segments of business operations	42
Cash in hand	$ 4,100,000	$ 3,700,000
Restricted cash amount	12,740,093	15,536,495				941,184	1,104,334	11,798,909	14,432,161								5,100,000	5,100,000		755,000		243,000	243,000	5,633,921	4,808,921	698,184	861,334	1,100,000	3,800,000	5,900,000	5,100,000	846,000	250,000	698,000
Number of uncollectible days which deemed and written off	365
Maximum percentage on revenues written off	1.00%	1.00%	1.00%
Accrued transportation costs	61,300,000	47,700,000
Deferred financing costs	2,200,000	3,200,000								2,200,000	1,100,000	2,300,000
Percentage of non-emergency transportation services revenue	83.00%
Exchangeable shares issued	287,576
Exchangeable shares issued, value	7,800,000
Exchangeable stock value for accounting purposes	7,600,000
Number of exchangeable shares per common stock	1
Number of exchangeable shares exchanged	25,882
Non-controlling interest	6,960,537	6,960,537
Dispute claims				300,000	13,000
Cash and other long-term liabilities	3,400,000
Maximum reinsurance coverage per loss/occurrence															250,000				100,000
Reinsurance coverage, aggregate amount															1,100,000				5,000,000		8,000,000
Maximum reinsurance coverage per loss/occurrence																					350,000
Reinsurance reserves													8,800,000	7,400,000	4,400,000	4,700,000
Percentage of gross written premium															107.70%
Maximum potential liability for individual claims	250,000
Self-funded insurance reserve	$ 2,100,000	$ 1,600,000