Long-Term Debt and Notes Payable - Additional Information (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Oct. 31, 2015
Debt Instrument [Line Items]
Debt issuance costs	$ 21,800,000	$ 27,100,000
Mexico [Member]
Debt Instrument [Line Items]
Bonds issued related to JRMSA general agreement of indemnity	49,400,000	52,500,000
Letter of Credit Facility [Member]
Debt Instrument [Line Items]
Letter of credit, first lien	400,000,000	400,000,000
Line of Credit Facility maximum amount outstanding	320,400,000	195,800,000
Letter of credit supported by Cash collateral	115,700,000	88,800,000
Letter of Credit Facility [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Letter of credit, first lien			$ 520,000,000
Reimbursement Agreement [Member]
Debt Instrument [Line Items]
Bank guarantees issued	89,200,000	56,200,000
Financial Letter of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility maximum amount outstanding	0	0
Letter of credit supported by Cash collateral	$ 46,500,000	$ 19,700,000