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Long-Term Debt - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Unamortized debt issue costs | $ 3,716,000 | $ 4,472,000
Senior Notes | 6% senior notes due 2022 |  |
Debt Instrument [Line Items] |  |
Debt maturity period | 2022 |
Interest rate (as a percent) | 6.00% |
Debt redemption period start date | Nov. 15, 2022 |
Senior Notes | 6% senior notes due 2022 | Minimum |  |
Debt Instrument [Line Items] |  |
Number of days prior notice required for redemption of notes | 30 days |
Senior Notes | 6% senior notes due 2022 | Maximum |  |
Debt Instrument [Line Items] |  |
Number of days prior notice required for redemption of notes | 60 days |
Line of Credit | Credit facility |  |
Debt Instrument [Line Items] |  |
Senior secured revolving line of credit | $ 550,000,000 |
Line of credit, maturity date | Jun. 26, 2020 |
Senior secured revolving line of credit | $ 100,000,000 |
Leverage ratio | 350.00% |
Borrowings outstanding | $ 100,000,000 |
Borrowing limit used | 1,000,000 |
Unamortized debt issue costs | $ 3,100,000 | $ 4,300,000
Line of Credit | Credit facility | Minimum |  |
Debt Instrument [Line Items] |  |
Commitment fee (as a percent) | 0.25% |
Fronting fees (as a percent) | 1.375% |
Line of Credit | Credit facility | Minimum | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Basis spread (as a percent) | 1.375% |
Line of Credit | Credit facility | Minimum | Base Rate |  |
Debt Instrument [Line Items] |  |
Basis spread (as a percent) | 0.375% |
Line of Credit | Credit facility | Maximum |  |
Debt Instrument [Line Items] |  |
Commitment fee (as a percent) | 0.35% |
Fronting fees (as a percent) | 2.00% |
Line of Credit | Credit facility | Maximum | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Basis spread (as a percent) | 2.00% |
Line of Credit | Credit facility | Maximum | Base Rate |  |
Debt Instrument [Line Items] |  |
Basis spread (as a percent) | 1.00% |

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- Definition Line of credit facility expected increase amount. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 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. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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