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Fair Value Measurements - Schedule of Book Value and Estimated Fair Value of Debt Instruments, Excluding Debt Financing Costs (Detail) - USD ($)
$ in Thousands
Jul. 15, 2017
Dec. 31, 2016
Book value of debt instruments, excluding debt financing costs:    
Current maturities of long-term debt and capital lease obligations $ 19,001 $ 17,424
Long-term debt and capital lease obligations 648,798 421,940
Total debt - Principal 667,799 439,364
Fair value of debt instruments, excluding debt financing costs 669,130 440,759
Excess of fair value over book value $ 1,331 $ 1,395