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Summary of Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 Carrying Amount | Dec. 31, 2012 Carrying Amount | Dec. 31, 2013 Carrying Amount Interest rate swap agreements | Dec. 31, 2012 Carrying Amount Interest rate swap agreements | Dec. 31, 2013 Carrying Amount Natural gas swap agreements | Dec. 31, 2012 Carrying Amount Natural gas swap agreements | Dec. 31, 2013 Fair Value | Dec. 31, 2012 Fair Value | Dec. 31, 2013 Fair Value Interest rate swap agreements | Dec. 31, 2012 Fair Value Interest rate swap agreements | Dec. 31, 2013 Fair Value Natural gas swap agreements | Dec. 31, 2012 Fair Value Natural gas swap agreements | Sep. 09, 2013 Senior Notes [Member] 5½% Senior Notes [Member] | Mar. 23, 2012 Senior Notes [Member] 5% Senior Notes due 2020 [Member] | Dec. 31, 2013 Senior Notes [Member] Carrying Amount 5½% Senior Notes [Member] | Dec. 31, 2012 Senior Notes [Member] Carrying Amount 5½% Senior Notes [Member] | Dec. 31, 2013 Senior Notes [Member] Carrying Amount 5% Senior Notes due 2020 [Member] | Dec. 31, 2012 Senior Notes [Member] Carrying Amount 5% Senior Notes due 2020 [Member] | Dec. 31, 2013 Senior Notes [Member] Fair Value 5½% Senior Notes [Member] | Dec. 31, 2012 Senior Notes [Member] Fair Value 5½% Senior Notes [Member] | Dec. 31, 2013 Senior Notes [Member] Fair Value 5% Senior Notes due 2020 [Member] | Dec. 31, 2012 Senior Notes [Member] Fair Value 5% Senior Notes due 2020 [Member] | Dec. 31, 2013 Bank Borrowings [Member] Carrying Amount | Dec. 31, 2012 Bank Borrowings [Member] Carrying Amount | Dec. 31, 2013 Bank Borrowings [Member] Fair Value | Dec. 31, 2012 Bank Borrowings [Member] Fair Value
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Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 160,463 | $ 465,608 |  |  |  |  | $ 160,463 | $ 465,608 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long term debt fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 | 0 | 500,000 | 500,000 | 298,125 | 0 | 495,625 | 522,500 | 903,836 | 1,171,316 | 903,836 | 1,171,316
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 5.50% | 5.00% |  |  |  |  |  |  |  |  |  |  |  |
Derivative liabilities |  |  | $ 6,895 | $ 13,307 | $ 22 | $ 279 |  |  | $ 6,895 | $ 13,307 | $ 22 | $ 279 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 Fair value of all liability derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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 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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