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Debt - 2020 Senior Notes - Additional Information (Detail) (USD $)
0 Months Ended 9 Months Ended 0 Months Ended 0 Months Ended
Apr. 12, 2013
Sep. 30, 2014
2020 Senior Notes [Member]
Apr. 13, 2012
Initial 2020 Senior Notes [Member]
2020 Senior Notes [Member]
Apr. 13, 2012
Initial 2020 Senior Notes [Member]
2020 Senior Notes [Member]
Aug. 21, 2012
Additional 2020 Senior Notes [Member]
2020 Senior Notes [Member]
Aug. 21, 2012
Additional 2020 Senior Notes [Member]
2020 Senior Notes [Member]
Debt Instrument [Line Items]            
Senior Notes issued amount       $ 550,000,000   $ 125,000,000
Stated interest rate of Senior Note       7.75%   7.75%
Initial offering price as percentage of principal amount     100.00%   105.50%  
Net proceeds from sale of Initial Notes     537,400,000   132,500,000  
Debt issuance costs     12,600,000   3,100,000  
Proceeds from offering retained for general corporate purposes     187,400,000      
Debt issue costs settled outside the bond proceeds       3,000,000    
IPO proceeds used to purchase New TMM Units $ 204,300,000          
Percentage of ownership by TMM Holdings   100.00%        
Senior Notes covenants description   The indenture for the 2020 Senior Notes contains covenants that limit (i) the making of investments, (ii) the payment of dividends and the redemption of equity and junior debt, (iii) the incurrence of additional indebtedness, (iv) asset dispositions, (v) mergers and similar corporate transactions, (vi) the incurrence of liens, (vii) the incurrence of prohibitions on payments and asset transfers among the issuers and restricted subsidiaries and (viii) transactions with affiliates, among others.        
Debt instrument purchase price, percentage   101.00%        
Debt instrument purchase price, description   If we do not apply the net cash proceeds of certain asset sales within specified deadlines, we will be required to offer to repurchase the 2020 Senior Notes at par (plus accrued and unpaid interest) with such proceeds. We are also required to offer to repurchase the 2020 Senior Notes at a price equal to 101% of their aggregate principal amount (plus accrued and unpaid interest) upon certain change of control events.