Long-Term Debt - Additional Information (Detail) - USD ($)		12 Months Ended
	Jun. 30, 2014	Dec. 30, 2017	Dec. 31, 2016	Dec. 31, 2017	Sep. 30, 1997
Debt Instrument [Line Items]
Junior Subordinated Debentures At Fair Value	$ 131,141
Trust Preferred Securities Issued Number					4,217,724
Trust Preferred Securities Underlying Price	$ 30.32
Interest Rate Junior Subordinated Debentures		11.60%
Trust Preferred Securities Liquidation Amount Per Preferred Security		$ 25.00
Senior secured credit facility consisting of revolver and term loan		$ 989,674,000	$ 973,455,000
Total Assets		1,799,217,000	1,781,636,000
Deferrals of distribution payments to holders of Trust Preferred Securities			0
Letter of credit commitments outstanding		6,536,000
Remaining borrowing capacity		43,964,000
Capitalized lease and other obligations		435,000	322,000
Debt, Long-term and Short-term, Combined Amount		989,389,000	975,276,000
Liabilities and Equity		1,799,217,000	1,781,636,000
Long-term Debt, Current Maturities		5,706,000	5,643,000
Trust Preferred Securities - Common [Domain]
Debt Instrument [Line Items]
Trust Preferred Security At Face Value			3,261,000
Non-current assets - junior subordinated debentures		3,261,000
6.375% Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 330,000,000	$ 330,000,000	$ 330,000,000
Interest rate on Senior Notes	6.375%	6.375%	6.375%
Junior Subordinated Debentures - Preferred [Domain]
Debt Instrument [Line Items]
Trust Preferred Security At Face Value		$ 105,443,000	$ 105,443,000
Senior Secured Credit Facility
Debt Instrument [Line Items]
Senior secured credit facility consisting of revolver and term loan	$ 620,000,000
Term Loan
Debt Instrument [Line Items]
Credit facility	$ 550,000,000
Maturity term of loan	7 years
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility	$ 70,000,000
Maturity term of loan	5 years
LIBOR | Term Loan
Debt Instrument [Line Items]
Debt instrument spread variable rate		3.50%
Adjusted interest rate				5.20%
LIBOR | Term Loan | Minimum
Debt Instrument [Line Items]
Debt instrument floor rate		1.00%
LIBOR | Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument spread variable rate		3.25%
Adjusted interest rate		6.80%
Alternate Base Rate | Term Loan
Debt Instrument [Line Items]
Debt instrument spread variable rate		2.50%
Alternate Base Rate | Term Loan | Minimum
Debt Instrument [Line Items]
Debt instrument floor rate		2.00%
Base Rate | Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument spread variable rate		2.25%
Term Loan
Debt Instrument [Line Items]
Senior secured credit facility consisting of revolver and term loan		$ 530,750,000	536,250,000
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility		19,500,000	0
Junior Subordinated Debentures [Member]
Debt Instrument [Line Items]
Interest Expense, Debt		12,231,000
Junior Subordinated Debentures - Preferred [Domain]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Premium, Current		22,437
Debt Instrument, Unamortized Premium		18,771,000	19,936,000
Trust Preferred Securities [Member]
Debt Instrument [Line Items]
Liabilities, Noncurrent		124,214,000
Non-current assets - junior subordinated debentures		124,214,000
Common Trust Securities [Member]
Debt Instrument [Line Items]
Liabilities, Noncurrent		3,261,000
Trust Securities [Member]
Debt Instrument [Line Items]
Total Assets		127,475,000
Liabilities and Equity		127,475,000
Long-term Debt
Debt Instrument [Line Items]
Unamortized debt issuance costs		$ 12,780,000	$ 16,114,000