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Interest coverage ratio.

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Number of covenants.

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Pro forma ratio of debt to earnings before interest taxes depreciation and amortization ratio.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Identification of whether the entity has been in compliance with any credit facility debt covenants during the period.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Long Term Debt - Credit Facilities - Additional Information (Detail)				12 Months Ended
	Mar. 18, 2015 USD ($) Covenant	Mar. 16, 2015	Sep. 27, 2012 USD ($) Covenant	Dec. 31, 2015 USD ($)	Apr. 01, 2016	Jan. 01, 2016	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Debt Instrument [Line Items]
Proceeds from long-term debt				$ 200,000,000
Assets				4,533,317,000			$ 5,394,011,000	$ 4,687,127,000
Letters of credit outstanding				41,100,000
Maximum \| Subsidiaries
Debt Instrument [Line Items]
Assets	$ 1,000,000
London Interbank Offered Rate (LIBOR) \| Scenario Forecast
Debt Instrument [Line Items]
Applicable margin					2.75%
Base Rate \| Scenario Forecast
Debt Instrument [Line Items]
Applicable margin					1.75%
Letter of Credit
Debt Instrument [Line Items]
Line of credit, amount outstanding				0
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit, available borrowing capacity				$ 500,000,000
Credit Agreement
Debt Instrument [Line Items]
Credit agreement date			Sep. 27, 2012
Aggregate amount by which the revolving credit facility can be increased			$ 100,000,000
Credit facility, maximum borrowing capacity			$ 700,000,000
Debt maturity date			Sep. 27, 2017
Commitment fee payable to the lenders for the unused portion of the credit facility			0.50%
Credit agreement, financial covenant description				The Company must not permit its debt to capitalization ratio to exceed 45%. The Credit Agreement generally defines the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the last day of the most recently ended fiscal quarter. The Company also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 3.00 to 1.00. The Credit Agreement generally defines the interest coverage ratio as the ratio of earnings before interest, taxes, depreciation and amortization (“EBITDA”) of the four prior fiscal quarters to interest charges for the same period. The Company was in compliance with these covenants at December 31, 2015.
Credit agreement, financial covenant compliance				The Company was in compliance with these covenants
Number of compliance covenants \| Covenant			2
Credit Agreement \| Minimum
Debt Instrument [Line Items]
Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter			300.00%
Credit Agreement \| Maximum
Debt Instrument [Line Items]
Debt to capitalization ratio, percentage the Company must not exceed at any time			45.00%
Credit Agreement \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				2.25%
Credit Agreement \| London Interbank Offered Rate (LIBOR) \| Subsequent Event
Debt Instrument [Line Items]
Applicable margin						2.25%
Credit Agreement \| London Interbank Offered Rate (LIBOR) \| Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			2.25%
Credit Agreement \| London Interbank Offered Rate (LIBOR) \| Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			3.25%
Credit Agreement \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				1.25%
Credit Agreement \| Base Rate \| Subsequent Event
Debt Instrument [Line Items]
Applicable margin						1.25%
Credit Agreement \| Base Rate \| Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			1.25%
Credit Agreement \| Base Rate \| Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			2.25%
Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Current aggregate borrowing capacity			$ 500,000,000
Line of credit, amount outstanding				$ 0
Credit Agreement \| Revolving Credit Facility \| Letter of Credit
Debt Instrument [Line Items]
Current aggregate borrowing capacity			150,000,000
Credit Agreement \| Revolving Credit Facility \| Swing Line Facility
Debt Instrument [Line Items]
Current aggregate borrowing capacity			40,000,000
Credit Agreement \| Term Loan Facility
Debt Instrument [Line Items]
Proceeds from long-term debt			$ 100,000,000
Line of credit facility, frequency of payment and payment terms				The term loan facility provides for a loan of $100 million, which was drawn on December 24, 2012. The term loan facility is payable in quarterly principal installments, which commenced December 27, 2012. The installment amounts vary from 1.25% of the original principal amount for each of the first four quarterly installments, 2.50% of the original principal amount for each of the subsequent eight quarterly installments, 5.00% of the original principal amount for the subsequent four quarterly installments and 13.75% of the original principal amount for the final four quarterly installments.
Line of credit facility, frequency of payments				Quarterly
Commencement date of principal payments			Dec. 27, 2012
Line of credit, amount outstanding				$ 70,000,000
Line of credit facility, interest rate				2.875%
Credit Agreement \| Term Loan Facility \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Installment amounts percentage of the original principal amount			1.25%
Credit Agreement \| Term Loan Facility \| Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Installment amounts percentage of the original principal amount			2.50%
Credit Agreement \| Term Loan Facility \| Debt Instrument, Redemption, Period Three [Member]
Debt Instrument [Line Items]
Installment amounts percentage of the original principal amount			5.00%
Credit Agreement \| Term Loan Facility \| Debt Instrument, Redemption, Period Four [Member]
Debt Instrument [Line Items]
Installment amounts percentage of the original principal amount			13.75%
Reimbursement Agreement
Debt Instrument [Line Items]
Letters of credit outstanding				$ 41,100,000
Reimbursement Agreement \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		2.25%
2015 Term Loan Agreement
Debt Instrument [Line Items]
Line of credit facility, frequency of payment and payment terms				The Term Loan Borrowing is payable in quarterly principal installments, together with accrued interest, on each June 30, September 30, December 31 and March 31, commencing on June 30, 2015. Each of the first four principal installments is in an amount equal to 2.5% of the Term Loan Borrowing and each successive quarterly installment, until and including June 30, 2017, is in an amount equal to 5.0% of the Term Loan Borrowing, with the outstanding principal balance of the Term Loan Borrowing due on the maturity date under the 2015 Term Loan Agreement. The maturity date under the 2015 Term Loan Agreement is September 27, 2017. Loans under the 2015 Term Loan Agreement bear interest, at the Company’s election, at the per annum rate of LIBOR rate plus 3.25% or base rate plus 2.25%.
Line of credit facility, frequency of payments				Quarterly
Commencement date of principal payments				Jun. 30, 2015
Debt maturity date				Sep. 27, 2017
Credit agreement, financial covenant description				The Company must not permit its debt to capitalization ratio to exceed 45%. The 2015 Term Loan Agreement generally defines the debt to capitalization ratio as the ratio of (a) total borrowed money indebtedness to (b) the sum of such indebtedness plus consolidated net worth, with consolidated net worth determined as of the most recently ended fiscal quarter. The Company also must not permit the interest coverage ratio as of the last day of a fiscal quarter to be less than 3.00 to 1.00. The 2015 Term Loan Agreement generally defines the interest coverage ratio as the ratio of EBITDA of the four prior fiscal quarters to interest charges for the same period. The Company was in compliance with these covenants at December 31, 2015.
Credit agreement, financial covenant compliance				The Company was in compliance with these covenants
Number of compliance covenants \| Covenant	2
Line of credit, amount outstanding	$ 200,000,000			$ 185,000,000
Line of credit facility, interest rate				3.875%
Quarterly interest payment, first payment date				June 30
Quarterly interest payment, second payment date				September 30
Quarterly interest payment, third payment date				December 31
Quarterly interest payment, fourth payment date				March 31
2015 Term Loan Agreement \| Minimum
Debt Instrument [Line Items]
Interest coverage ratio that the Company must exceed on the last day of the fiscal quarter	300.00%
2015 Term Loan Agreement \| Maximum
Debt Instrument [Line Items]
Debt to capitalization ratio, percentage the Company must not exceed at any time	45.00%
Pro forma ratio of debt to EBITDA	250.00%
2015 Term Loan Agreement \| Maximum \| Subsidiaries
Debt Instrument [Line Items]
Assets	$ 1,000,000
2015 Term Loan Agreement \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				3.25%
2015 Term Loan Agreement \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				2.25%
2015 Term Loan Agreement \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Installment amounts percentage of the original principal amount				2.50%
2015 Term Loan Agreement \| Debt Instrument, Redemption, Period Five [Member]
Debt Instrument [Line Items]
Installment amounts percentage of the original principal amount				5.00%