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Common Stock and Share-Based Compensation - Narrative (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Preferred stock authorized (shares) 1,000,000                       1,000,000    
Common stock authorized (shares) 250,000,000                       250,000,000    
Common stock, par value (USD per share) $ 0.01       $ 0.01               $ 0.01 $ 0.01  
Dividends paid (USD per share) $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 0.07 $ 0.07 $ 0.07 $ 0.07      
Cash dividends paid                         $ (32,737,000) $ (32,828,000) $ (26,182,000)
Authorized to repurchase common stock $ 2,380,000,000.00                       2,380,000,000.00    
Stock repurchased (shares)                           1,371,000  
Common stock repurchases (shares)                         $ 0 $ 25,000,000 $ 53,010,000
Shares available for issuance (shares) 11,700,000                       11,700,000    
Dean Foods Company Two Thousand Seven Stock Incentive Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Stock option awarded (shares)                         1.67    
Stock Options                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total unrecognized stock option expense $ 0                       $ 0    
Cash received from stock option exercises                         2,700,000    
Cash benefit for tax deductions realized for option exercises                         200,000    
Restricted Stock Units (RSUs)                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Total unrecognized stock option expense 7,400,000                       $ 7,400,000    
Unrecognized compensation expense expected to be recognized period                         11 months 27 days    
Restricted Stock Units (RSUs) | Employees                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Award vesting period                         3 years    
Restricted Stock Units (RSUs) | Non-Employee Directors                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Award vesting period                         3 years    
Restricted Stock | Non-Employee Directors                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Fee value option to receive in restricted stock (as a percent)                         150.00%    
PSUs                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Award vesting period                         3 years    
Phantom Shares                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Award vesting period                         3 years    
Common Stock                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Stock repurchased (shares)                           1,371,185 3,165,582
Amount available for repurchase $ 197,100,000                       $ 197,100,000    
Minimum | PSUs                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting amount (as a percent)                         0.00%    
Maximum | PSUs                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Vesting amount (as a percent)                         200.00%    
2016 Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Maximum stock options grants (shares) 11,750,000                       11,750,000