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Financial Instruments - Summary of Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 13, 2017 | Sep. 09, 2013 | Mar. 23, 2012
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USD Interest Rate Swap Contract One [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Derivative, Notional Amount | $ 50,000 |  |  |  |
Liabilities: |  |  |  |  |
Derivative, Fixed Interest Rate | 2.878% |  |  |  |
USD Interest Rate Swap Contract Two [Member] |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Derivative, Notional Amount | $ 50,000 |  |  |  |
Liabilities: |  |  |  |  |
Derivative, Fixed Interest Rate | 2.878% |  |  |  |
Carrying Amount |  |  |  |  |
Assets: |  |  |  |  |
Cash and cash equivalents | $ 72,819 | $ 53,533 |  |  |
Fair Value |  |  |  |  |
Assets: |  |  |  |  |
Cash and cash equivalents | 72,819 | 53,533 |  |  |
Bank Borrowings [Member] | Carrying Amount |  |  |  |  |
Liabilities: |  |  |  |  |
Long term debt fair value | 951,800 | 903,945 |  |  |
Bank Borrowings [Member] | Fair Value |  |  |  |  |
Liabilities: |  |  |  |  |
Long term debt fair value | 951,800 | 903,945 |  |  |
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 | Four and Three Quarters Percent Senior Notes due 2025 [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Long term debt fair value | 300,000 | 300,000 |  |  |
Senior Notes [Member] | Carrying Amount | Three and One Quarter Percent Senior Notes due 2025 [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Long term debt fair value | 744,380 | 780,325 |  |  |
Senior Notes [Member] | Fair Value | 5½% Senior Notes [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Long term debt fair value | 301,761 | 308,301 |  |  |
Senior Notes [Member] | Fair Value | Four and Three Quarters Percent Senior Notes due 2025 [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Long term debt fair value | 284,517 | 309,390 |  |  |
Senior Notes [Member] | Fair Value | Three and One Quarter Percent Senior Notes due 2025 [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Long term debt fair value | $ 746,591 | $ 813,793 |  |  |

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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 No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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