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Summary of Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Detail) $ in Thousands, MMBTU in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) MMBTU | Dec. 31, 2015 USD ($) MMBTU | Sep. 09, 2013 | Mar. 23, 2012
Interest rate swap agreements |  |  |  |
Liabilities: |  |  |  |
Derivative liabilities | $ 50,000 |  |  |
Derivative Maturity Month And Year | 2017 |  |  |
Interest Rate Swap [Member] |  |  |  |
Liabilities: |  |  |  |
Derivative liabilities | $ 100,000 |  |  |
Natural Gas Commodity [Member] |  |  |  |
Liabilities: |  |  |  |
Derivative, Nonmonetary Notional Amount | MMBTU | 1.4 | 1.4 |  |
Carrying Amount |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | $ 24,690 | $ 99,945 |  |
Carrying Amount | Natural Gas [Member] |  |  |  |
Assets: |  |  |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value | 1,094 |  |  |
Liabilities: |  |  |  |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value | 0 | 813 |  |
Carrying Amount | Interest Rate Swap [Member] |  |  |  |
Liabilities: |  |  |  |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value | 244 | 771 |  |
Fair Value |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 24,690 | 99,945 |  |
Fair Value | Natural Gas [Member] |  |  |  |
Assets: |  |  |  |
Cash Flow Hedge Derivative Instrument Assets at Fair Value | 1,094 |  |  |
Liabilities: |  |  |  |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value | 0 | 813 |  |
Fair Value | Interest Rate Swap [Member] |  |  |  |
Liabilities: |  |  |  |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value | 244 | 771 |  |
Senior Notes [Member] | 5½% Senior Notes [Member] |  |  |  |
Liabilities: |  |  |  |
Stated interest rate |  |  | 5.50% |
Senior Notes [Member] | 5% Senior Notes [Member] |  |  |  |
Liabilities: |  |  |  |
Stated interest rate |  |  |  | 5.00%
Senior Notes [Member] | Carrying Amount | 5½% Senior Notes [Member] |  |  |  |
Liabilities: |  |  |  |
Long term debt fair value | 300,000 | 300,000 |  |
Senior Notes [Member] | Carrying Amount | 5% Senior Notes [Member] |  |  |  |
Liabilities: |  |  |  |
Long term debt fair value | 500,000 | 500,000 |  |
Senior Notes [Member] | Fair Value | 5½% Senior Notes [Member] |  |  |  |
Liabilities: |  |  |  |
Long term debt fair value | 312,750 | 309,189 |  |
Senior Notes [Member] | Fair Value | 5% Senior Notes [Member] |  |  |  |
Liabilities: |  |  |  |
Long term debt fair value | 510,130 | 510,055 |  |
Bank Borrowings [Member] | Carrying Amount |  |  |  |
Liabilities: |  |  |  |
Long term debt fair value | 771,192 | 725,818 |  |
Bank Borrowings [Member] | Fair Value |  |  |  |
Liabilities: |  |  |  |
Long term debt fair value | $ 771,192 | 725,818 |  |
Other Liabilities [Member] | Interest Rate Swap [Member] |  |  |  |
Liabilities: |  |  |  |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value |  | $ 100 |  |

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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