Description of dividends paid, restrictions on dividend payments, statutory capital and surplus amounts, requirements and future requirements.

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Related Party Transactions - Additional Information (Detail) - USD ($)					1 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended
	May 17, 2017	Jun. 01, 2016	Jan. 08, 2016	Jan. 04, 2016	Jun. 30, 2016	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Proceeds from common stock sales								$ 2,850,000
Termination fee		$ 31,000,000
Aggregate fees and expenses						$ 2,000,000		$ 5,000,000
Cash distribution paid			$ 666,000,000
Cash distribution paid to Sponsors				$ 657,000,000
Distribution declared and paid per share			$ 3.94					$ 3.94
Dividends payment description							The Company has no current plans to pay future dividends, and has never paid dividends on its common stock, other than the January 2016 one-time cash distribution. Any decision to declare and pay dividends in the future will be made at the sole discretion of our Board of Directors, and could be limited by USF debt covenants.
KKR Capital Markets LLC [Member]
Related Party Transaction [Line Items]
Cost of services rendered in connection with debt refinancing transactions					$ 1,000,000
USF Credit Facility [Member]
Related Party Transaction [Line Items]
Line of credit outstanding amount			$ 314,000,000
Follow-on Offerings [Member]
Related Party Transaction [Line Items]
Proceeds from common stock sales	$ 0
Secondary Offerings [Member]
Related Party Transaction [Line Items]
Expenses related to shares sold	$ 3,000,000								$ 1,000,000
IPO [Member]
Related Party Transaction [Line Items]
Number of shares sold		51,111,111
IPO [Member] \| KKR Capital Markets LLC [Member]
Related Party Transaction [Line Items]
Underwriter discounts and commissions					$ 5,000,000
Sponsor \| Follow-on Offerings [Member]
Related Party Transaction [Line Items]
Number of shares sold	87,400,000
Sponsor ownership interest percentage	18.00%
Entities Affiliated [Member] \| Amended and Restated 2016 Term Loan [Member]
Related Party Transaction [Line Items]
Percentage of Company's outstanding debt managed by affiliate							1.00%