Debt Guarantees (Details)	3 Months Ended					3 Months Ended
	Mar. 31, 2015 Geo Amey USD ($)	Mar. 31, 2015 Geo Amey GBP (£)	Mar. 31, 2015 Ravenhall USD ($) guarantee	Sep. 30, 2014 Ravenhall Letter of Credit Revolver USD ($)	Sep. 30, 2014 Ravenhall Letter of Credit Revolver AUD	Mar. 31, 2015 SACS ZAR	Mar. 31, 2015 SACS USD ($)	Mar. 31, 2015 Canada Facility USD ($)	Mar. 31, 2015 Canada Facility CAD
Line of Credit Facility [Line Items]
Guaranteed obligations				$ 164,600,000	214,000,000	22,000,000	$ 1,800,000
Remaining guarantee under letter of credit						21,000,000
Maximum loan amount under standby facility						20,000,000	1,656,000
Potential estimated exposure of tax obligations								2,000,000	2,500,000
Liability related to potential tax exposure								2,000,000
Number of letters of guarantee outstanding under separate international facilities relating to performance guarantees			9
Letters of credit outstanding relating to performance guarantees			11,700,000
Ownership percentage in South African Custodial Services Pty. Limited	50.00%	50.00%
Working capital line of credit issued to GEOAmey		12,000,000
Note receivable for GEOAmey	$ 15,600,000	£ 10,500,000