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STOCKHOLDER'S EQUITY (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 4 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Feb. 04, 2015 USD ($) board_of_director_class Vote / shares $ / shares shares | Dec. 15, 2014 | Dec. 30, 2015 $ / shares shares | Aug. 31, 2015 $ / shares shares | Dec. 30, 2015 $ / shares shares | Dec. 30, 2015 $ / shares shares | Dec. 28, 2016 USD ($) $ / shares shares | Dec. 30, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  |  |  |  |  |  |  |
Common stock par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized | 10,000,000 |  | 10,000,000 |  | 10,000,000 | 10,000,000 | 10,000,000 | 10,000,000 |
Number of classes of directors | board_of_director_class | 3 |  |  |  |  |  |  |  |
Board of directors, term | 3 years |  |  |  |  |  |  |  |
Number of votes per share | Vote / shares | 1 |  |  |  |  |  |  |  |
LLC interests acquired | 5,968,841 |  |  |  | 2,848,035 |  | 5,207,149 | 6,003,308 |
Member distribution threshold, percentage |  | 27.30% |  |  |  |  |  |  |
Member distributions | $ | $ 11,125 |  |  |  |  |  | $ 0 | $ 11,125 | $ 27,070
Class A Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized | 200,000,000 |  | 200,000,000 |  | 200,000,000 | 200,000,000 | 200,000,000 | 200,000,000 |
Common stock par value (in dollars per share) | $ / shares | $ 0.001 |  | $ 0.001 |  | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 |
Ratio of common stock to limited liability company interest | 1 |  |  |  |  |  |  |  |
Class B Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares authorized | 35,000,000 |  | 35,000,000 |  | 35,000,000 | 35,000,000 | 35,000,000 | 35,000,000 |
Common stock par value (in dollars per share) | $ / shares | $ 0.001 |  | $ 0 |  | $ 0 | $ 0 | $ 0.001 | $ 0 |
Ratio of common stock to limited liability company interest | 1 |  |  |  |  |  |  |  |
Secondary offering |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
LLC interests acquired |  |  |  | 3,155,273 |  |  |  |  |
USC Merger |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
LLC interests acquired |  |  | 1,727,804 |  |  |  |  |  |
Common stock | Class A Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares issued during the period | 5,968,841 |  |  |  |  | 5,750,000 |  |  |
Redemptions (shares) |  |  |  |  | 2,848,035 |  | 5,207,149 |  |
Common stock | Class B Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares issued during the period | 30,160,694 |  |  |  |  |  |  |  |
Effect of redemption (shares) | 5,968,841 |  |  |  | 2,848,035 |  | 5,207,149 |  |
Common stock | IPO | Class A Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares issued during the period | 5,750,000 |  |  |  |  |  |  |  |
Proceeds of issuance of initial public offering net of underwriting discounts and commissions | $ | $ 112,298 |  |  |  |  |  |  |  |
Shares issued, share price (in dollars per share) | $ / shares | $ 21 |  |  |  |  |  |  |  |
Common stock | Over-allotment option | Class A Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares issued during the period | 750,000 |  |  |  |  |  |  |  |
Common stock | Secondary offering | Class A Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares issued, share price (in dollars per share) | $ / shares |  |  |  | $ 60 |  |  |  |  |
Total conversion of units (shares) |  |  |  | 4,000,000 |  |  |  |  |
Conversion of units from former equity owners (shares) |  |  |  | 844,727 |  |  |  |  |
Redemptions (shares) |  |  |  | 3,155,273 |  |  |  |  |
Common stock | Secondary offering | Class B Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Effect of redemption (shares) |  |  |  | 3,155,273 |  |  |  |  |
Common stock | USC Merger | Class A Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares issued during the period |  |  | 1,727,804 |  |  |  |  |  |
Redemptions (shares) |  |  |  |  |  | 1,727,804 |  |  |
Common stock | USC Merger | Class B Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Redemptions (shares) |  |  |  |  |  | (1,727,804) |  |  |
Effect of redemption (shares) |  |  | 1,727,804 |  |  |  |  |  |
Limited Liability Company |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of units redeemed (shares) |  |  |  |  | 2,848,035 |  | 5,207,149 |  |
Limited Liability Company | Secondary offering |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of units redeemed (shares) |  |  |  | 3,155,273 |  |  |  |  |

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