Fair Value Measurements, Derivatives and Other - Derivatives (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Cross-border debt offering			$ 280,000,000
Proceeds from settlement of foreign currency forwards attributable to the repaid cross-border debt			3,557,000	$ 2,313,000	$ 0
Guarantee liability			1,258,000	0
Non-designated derivatives | Foreign currency forwards — discontinued operations | Loss from discontinued operations, net of tax
Derivative Instruments, Gain (Loss) [Line Items]
Amount of unrealized gain			(3,848,000)	9,529,000	1,152,000
Prepaid expenses and other current assets
Derivative Instruments, Gain (Loss) [Line Items]
Guarantee liability			1,209,000
Accounts payable, accrued expenses and other current liabilities
Derivative Instruments, Gain (Loss) [Line Items]
Guarantee liability			(1,258,000)
Other assets, net | Non-designated derivatives | Convertible Notes Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, asset of derivative instruments			37,692,000	10,505,000
Other current liabilities | Non-designated derivatives | Convertible Notes Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, (liabilities) of derivative instruments			(37,692,000)	(10,505,000)
Grupo Finmart | Foreign currency forwards — discontinued operations
Derivative Instruments, Gain (Loss) [Line Items]
Proceeds from settlement of foreign currency forwards attributable to the repaid cross-border debt		$ 2,300,000
Unsecured Notes 9 Percent Due 2015 | Grupo Finmart
Derivative Instruments, Gain (Loss) [Line Items]
Cross-border debt offering					$ 30,000,000.0
8.5% unsecured notes due 2015
Derivative Instruments, Gain (Loss) [Line Items]
Proceeds from settlement of foreign currency forwards attributable to the repaid cross-border debt	$ 3,600,000
Recurring | Convertible Notes Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, asset of derivative instruments			37,692,000	10,505,000
Recurring | Non-designated derivatives | Foreign currency forwards — discontinued operations
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, asset of derivative instruments				14,169,000
Guarantee asset			1,209,000
Guarantee liability			1,258,000
Recurring | Current and non-current assets held for sale | Designated as hedging instrument | Foreign currency forwards — discontinued operations
Derivative Instruments, Gain (Loss) [Line Items]
Fair value, asset of derivative instruments			$ 0	14,169,000
Recurring | Prepaid expenses and other current assets | Non-designated derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Guarantee asset				0
Recurring | Accounts payable, accrued expenses and other current liabilities | Non-designated derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Guarantee liability				$ 0