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Long-Term Debt - Additional Information (Detail) |  |  | 1 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 02, 2016 USD ($) | Oct. 31, 2014 | Oct. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) | Oct. 02, 2007 USD ($) Loan | Nov. 15, 2005 USD ($) Loan
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest coverage ratio |  | 250.00% |  |  |  |  |
Unused line of credit commitment fee based on leverage ratio |  | 0.10% |  |  |  |  |
Borrowings outstanding under Credit Facility |  |  |  | $ 185,000,000 | $ 225,000,000 |  |
Bank Credit Facility, borrowings available |  |  |  | 305,600,000 |  |  |
Letter of Credit Facility |  |  |  | 40,000,000 |  |  |
Letters of credit outstanding, amount |  |  |  | $ 9,400,000 |  |  |
Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Consolidated funded indebtedness ratio |  | 350.00% |  |  |  |  |
Unused line of credit commitment fee based on leverage ratio |  | 0.35% |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable margin |  | 1.00% |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable margin |  | 2.25% |  |  |  |  |
Federal Funds Effective Swap Rate [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable margin |  | 0.00% |  |  |  |  |
Federal Funds Effective Swap Rate [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable margin |  | 1.25% |  |  |  |  |
4.500% Senior Unsecured Notes Due 2026 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, principal amount | $ 350,000,000 |  |  |  |  |  |
Debt instrument, interest rate | 4.50% |  |  | 4.50% |  |  |
Debt instrument, maturity period | 2026-08 |  |  |  |  |  |
4.500% Senior Unsecured Notes Due 2026 [Member] | Prior to August 1, 2019 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price, percentage | 104.50% |  |  |  |  |  |
4.500% Senior Unsecured Notes Due 2026 [Member] | On or After August 1, 2019 and Prior to August 1, 2021 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price, percentage | 100.00% |  |  |  |  |  |
4.500% Senior Unsecured Notes Due 2026 [Member] | Maximum [Member] | Prior to August 1, 2019 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percentage of principal amount redeemable | 40.00% |  |  |  |  |  |
2005 Note Purchase Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior Notes, sale |  |  |  |  |  |  | $ 200,000,000
Number of tranches | Loan |  |  |  |  |  |  | 3
2007 Note Purchase Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest coverage ratio |  |  |  | 250.00% |  |  |
Senior Notes, sale |  |  |  |  |  | $ 200,000,000 |
Number of tranches | Loan |  |  |  |  |  | 4 |
Senior Notes, payment terms |  |  |  | Interest for each tranche of Notes is payable semi-annually April 2 and October 2 of each year until all principal is paid for the respective tranche. |  |  |
Purchase agreement additional requirements |  |  |  | and to maintain an interest coverage ratio (Consolidated EBITDA to Consolidated Interest Expense (calculated as consolidated EBITDA, as defined above, to consolidated interest expense)) of at least 2.50:1.00. In addition, the 2007 Note Purchase Agreement requires the Company to ensure that at all times either (i) Consolidated Total Assets equal at least 80% of the consolidated total assets of the Company and its Subsidiaries, determined in accordance with GAAP, or (ii) consolidated total revenues of the Company and its Restricted Subsidiaries for the period of four consecutive fiscal quarters most recently ended equals at least 80% of the consolidated total revenues of the Company and its Subsidiaries during such period. |  |  |
Senior Notes, permitted minimum aggregate principal amount prepayment without penalty |  |  |  | 10.00% |  |  |
Percentage of face value to be paid if notes are prepaid |  |  |  | 100.00% |  |  |
Senior Notes, calculation of make-whole amount, description |  |  |  | Discounting the remaining scheduled payments of interest and principal of the Private Placement Senior Unsecured Notes being prepaid at a discount rate equal to the sum of 50 basis |  |  |
Discount on Senior Notes principal and interest |  |  |  | 0.50% |  |  |
2007 Note Purchase Agreement [Member] | Series 2007A Tranche C [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of debt |  |  | $ 24,000,000 |  |  |  |
2007 Note Purchase Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percentage of consolidated assets require to maintain |  |  |  | 80.00% |  |  |
Percentage of consolidated revenues require to maintain |  |  |  | 80.00% |  |  |
2007 Note Purchase Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Consolidated funded indebtedness ratio |  |  |  | 350.00% |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit Facility, principal balance |  |  |  | $ 500,000,000 |  |  |
Credit Facility, termination date |  |  |  | Aug. 02, 2021 |  |  |
Credit Facility, interest rate description |  |  |  | At the option of the Company, outstanding principal amounts on the Credit Facility bear interest at a variable rate equal to (i) The London Interbank Offered Rate (“LIBOR”) for the selected period, plus an applicable rate (ranging from 100 to 225 basis points), which is to be established quarterly based upon the Company’s ratio of consolidated EBITDA, defined as earnings before interest, taxes, depreciation and amortization, to the Company’s consolidated indebtedness (the “Leverage Ratio”), or (ii) an alternative base rate which is the higher of (a) the prime rate or (b) the federal funds rate plus 1⁄2% per annum plus an applicable rate (ranging from 0 to 125 basis points). Interest payments are payable, in the case of loans bearing interest at a rate based on the federal funds rate, quarterly, or in the case of loans bearing interest at a rate based on LIBOR, at the end of the applicable interest period. The Company is also required to pay a commitment fee on unused available borrowings under the Credit Facility ranging from 10 to 35 basis points depending upon the Leverage Ratio. |  |  |
Revolving Credit Facility [Member] | Swingline Loan [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Credit Facility, principal balance |  |  |  | $ 25,000,000 |  |  |
Line of Credit | Federal Funds Effective Swap Rate [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable margin |  | 0.50% |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Bank Credit Facility, one-time fee |  |  |  | 0.125% |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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