Commitments and Contingencies - Additional Information (Details)								3 Months Ended
	Apr. 17, 2017 USD ($)	Feb. 07, 2017 plaintiff	Feb. 06, 2017 USD ($)	Jan. 30, 2017 USD ($)	Dec. 22, 2016 USD ($)	Aug. 01, 2012 USD ($)	Jul. 31, 2012 USD ($)	Apr. 30, 2017 USD ($) plaintiff	Oct. 31, 2016 USD ($)	Dec. 31, 2014 USD ($)
Loss Contingencies
Standby letters of credit								$ 128,900,000	$ 130,900,000
Surety bonds								546,600,000
Guarantee obligation								$ 88,500,000	$ 60,900,000
Subsidiary ownership interest percentage								33.00%
Loss contingency amount accrued for probable losses								$ 129,000,000
Augustus and Karapetyan
Loss Contingencies
Loss contingency amount accrued for probable losses								115,000,000
Payroll Taxes
Loss Contingencies
Loss contingency amount accrued for probable losses								6,800,000
Other Probable Litigation
Loss Contingencies
Loss contingency amount accrued for probable losses								$ 7,200,000
Augustus
Loss Contingencies
Payment awarded to plaintiffs						$ 4,500,000	$ 89,700,000
Percentage of damages awarded						30.00%
Reversal of initial award										$ 89,700,000
Settlement interest					$ 41,200,000
Augustus Settlement Agreement
Loss Contingencies
Settlement amount			$ 110,000,000
Karapetyan
Loss Contingencies
Settlement amount	$ 5,000,000
Settlement term sheet amount				$ 5,000,000
Isse
Loss Contingencies
Number of plaintiffs | plaintiff		60						92
Parental
Loss Contingencies
Total guarantees								$ 35,000,000
Minimum
Loss Contingencies
Amount of reasonably possible loss								0
Maximum
Loss Contingencies
Amount of reasonably possible loss								$ 16,000,000