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Summary of Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Feb. 13, 2017 | Dec. 31, 2016 | Sep. 09, 2013 | Mar. 23, 2012
--- | --- | --- | --- | --- | ---
Carrying Amount |  |  |  |  |
Assets: |  |  |  |  |
Cash and cash equivalents | $ 53,533 |  | $ 24,690 |  |
Derivative instruments (other current assets) | 1,150 |  | 1,094 |  |
Liabilities: |  |  |  |  |
Derivative instruments (accrued liabilities) | 115 |  | 244 |  |
Fair Value |  |  |  |  |
Assets: |  |  |  |  |
Cash and cash equivalents | 53,533 |  | 24,690 |  |
Derivative instruments (other current assets) | 1,150 |  | 1,094 |  |
Liabilities: |  |  |  |  |
Derivative instruments (accrued liabilities) | 115 |  | 244 |  |
Bank Borrowings [Member] | Carrying Amount |  |  |  |  |
Liabilities: |  |  |  |  |
Long term debt fair value | 903,945 |  | 771,192 |  |
Bank Borrowings [Member] | Fair Value |  |  |  |  |
Liabilities: |  |  |  |  |
Long term debt fair value | 903,945 |  | 771,192 |  |
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] | Four and Three Quarters Percent Senior Notes due 2025 [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Stated interest rate |  | 4.75% |  |  |
Senior Notes [Member] | Three and One Quarter Percent Senior Notes due 2025 [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Stated interest rate |  | 3.25% |  |  |
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 | 280,000 |  | 500,000 |  |
Senior Notes [Member] | Carrying Amount | Four and Three Quarters Percent Senior Notes due 2025 [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Long term debt fair value | 300,000 |  | 0 |  |
Senior Notes [Member] | Carrying Amount | Three and One Quarter Percent Senior Notes due 2025 [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Long term debt fair value | 780,325 |  | 0 |  |
Senior Notes [Member] | Fair Value | 5½% Senior Notes [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Long term debt fair value | 308,301 |  | 312,750 |  |
Senior Notes [Member] | Fair Value | 5% Senior Notes [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Long term debt fair value | 281,691 |  | 510,130 |  |
Senior Notes [Member] | Fair Value | Four and Three Quarters Percent Senior Notes due 2025 [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Long term debt fair value | 309,390 |  | 0 |  |
Senior Notes [Member] | Fair Value | Three and One Quarter Percent Senior Notes due 2025 [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Long term debt fair value | $ 813,793 |  | $ 0 |  |

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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 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 Carrying amount as of the balance sheet date of the asset arising from derivative instruments and hedging activities, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer. + 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 210.5-02.8) -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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