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Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016
Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Cash and cash equivalents | $ 142,083 | $ 142,083 |  |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Natural Gas [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Assets | 103 | 103 |  |
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Cash and cash equivalents | 142,083 | 142,083 |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Natural Gas [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Assets | 103 | 103 |  |
Bank debt [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Long-Term Debt | 1,489,971 | 1,489,971 |  |
Bank debt [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Long-Term Debt | 1,489,971 | 1,489,971 |  |
5% Senior Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Long-Term Debt | 280,000 | 280,000 |  |
5% Senior Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Long-Term Debt | 283,903 | 283,903 |  |
5 1/2% Senior Notes [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Long-Term Debt | 300,000 | 300,000 |  |
5 1/2% Senior Notes [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Long-Term Debt | 309,558 | 309,558 |  |
4 3/4% Senior Notes due 2025 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Long-Term Debt | 300,000 | 300,000 |  |
4 3/4% Senior Notes due 2025 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Long-Term Debt | 307,533 | 307,533 |  |
3 1/4% Senior Notes due 2025 [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Long-Term Debt | 742,105 | 742,105 |  |
3 1/4% Senior Notes due 2025 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Long-Term Debt | $ 762,238 | $ 762,238 |  |
5% Senior Notes due 2020 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Senior note interest rate (percent) | 5.00% | 5.00% | 5.00% | 5.00%
5% Senior Notes due 2020 [Member] | Senior Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Senior note interest rate (percent) | 5.00% | 5.00% |  |
5 1/2% Senior Notes due 2022 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Senior note interest rate (percent) | 5.50% | 5.50% | 5.50% | 5.50%
5 1/2% Senior Notes due 2022 [Member] | Senior Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Senior note interest rate (percent) | 5.50% | 5.50% |  |
3 1/4% Senior Notes due 2025 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Senior note interest rate (percent) | 3.25% | 3.25% |  |
4 3/4% Senior Notes due 2025 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Senior note interest rate (percent) | 4.75% | 4.75% |  |
Accumulated Translation Adjustment [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Foreign currency (losses) of net investment hedges included in accumulated other comprehensive loss | $ (23,600) | $ (28,500) |  |

X
- 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 Fair value of all asset 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=84234895&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 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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