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Summary of Components of Long-Term Debt Obligations (Parenthetical) (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |
Long-term debt, current portion | $ 0 | $ 0
6.0% Senior Notes Due 2022 |  |
Debt Instrument [Line Items] |  |
Interest percentage | 6.00% | 6.00%
Debt maturity period | 2022 | 2022

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- Definition Debt instrument maturity year. + References No definition available. + Details
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Period Type: | duration

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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 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 Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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Balance Type: |
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