Leases - Additional Disclosure (Details) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2014 USD ($) extension_option	Mar. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)
Operating Leased Assets [Line Items]
Estimated minimum future rental payments			$ 275,747
Estimated future minimum sublease payments			7,176
Corporate Office Lease [Member]
Operating Leased Assets [Line Items]
Initial term of lease, in years	13 years
Number of extension options | extension_option	2
Renewable term of lease, in years	5 years
Annual rent at lease inception	$ 3,000
Annual rent in the terminal year of lease	$ 4,600
Estimated minimum future rental payments			$ 57,100
Regional Offices Sublease [Member] | Miami and Mexico City [Member]
Operating Leased Assets [Line Items]
Estimated future minimum sublease payments		$ 8,700
Annual total sublease payments at sublease inception		600
Annual total sublease payments in the terminal year of the last sublease		$ 1,000
Regional Offices Sublease [Member] | Miami [Member]
Operating Leased Assets [Line Items]
Sublease term		9 years
Regional Offices Sublease [Member] | Mexico City [Member]
Operating Leased Assets [Line Items]
Sublease term		3 years
Minimum [Member]
Operating Leased Assets [Line Items]
Initial term of lease, in years			3 years
Renewable term of lease, in years			3 years
Maximum [Member]
Operating Leased Assets [Line Items]
Initial term of lease, in years			10 years
Renewable term of lease, in years			5 years