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Equity - Summary of Class M Unit Award Activity (Detail) (New TMM Units [Member], Time Vesting Units [Member], USD $)
9 Months Ended
Sep. 30, 2014
New TMM Units [Member] | Time Vesting Units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Awards, Beginning balance 1,655,469
Number of Awards, Exercised (195,171)
Number of Awards, Forfeited (27,724)
Number of Awards, Ending balance 1,432,574
Weighted Average Grant Date Fair Value, Beginning balance $ 5.02
Weighted Average Grant Date Fair Value, Exercised $ 4.20
Weighted Average Grant Date Fair Value, Forfeited $ 6.09
Weighted Average Grant Date Fair Value, Ending balance $ 5.11