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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 26, 2018
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation   $ 5.0   $ 6.6 $ 28.2 $ 25.2
Tax benefit recognized related to the compensation cost of share-based awards   1.3   2.4 7.1 9.3
Expense on modification of stock award     $ 10.0      
Performance units converted into shares of common stock 79,910          
Conversion ratio of awards vesting 23.00%          
Employee Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation   0.8   2.3 $ 4.9 6.8
Expense on modification of stock award     1.2      
Share based compensation arrangement, award expiration period         10 years  
Compensation costs, unrecognized   3.9     $ 3.9  
Compensation costs, recognition weighted average remaining period (in years)         1 year 3 months 18 days  
Restricted Stock Unit            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expense on modification of stock award     3.8      
Performance Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation   0.4   (1.2) $ 6.2 1.1
Expense on modification of stock award     $ 5.0      
Compensation costs, unrecognized   $ 2.6     $ 2.6  
Compensation costs, recognition weighted average remaining period (in years)         2 years 2 months 12 days  
Share based compensation arrangement, award vesting period         0 years  
Stock units, vested 18,139       18,000  
Performance Units | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Predefined percentage for calculation of performance unit awards         0.00%  
Performance Units | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Predefined percentage for calculation of performance unit awards         200.00%  
Director Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of restricted stock units, earned and deferred   91,400     91,400  
Stock units, vested         25,000  
Employee Restricted Stock Units and Director Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation   $ 3.8   $ 5.5 $ 17.1 $ 17.3
Compensation costs, unrecognized   $ 24.7     $ 24.7  
Compensation costs, recognition weighted average remaining period (in years)         2 years  
TreeHouse Foods, Inc. Equity and Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum number of shares available to be awarded   16,100,000     16,100,000  
Shares available   3,800,000     3,800,000