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Debt - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jan. 20, 2016 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Term of loan |  | 5 years
Agreement date |  | Apr. 18, 2014
Aggregate loan amount |  | $ 750,000,000
Sub-facility for letter of credit |  | 150,000,000
Sub-facility for swing line loans |  | 50,000,000
Increase in aggregate principal amount |  | $ 250,000,000
Base rate | 0.75% |
Maximum capitalization ratio | 45.00% | 50.00%
Minimum interest coverage ratio |  | 300.00%
Minimum asset coverage ratio | 150.00% |
Percentage increase in commitment fee | 0.05% |
Percentage of equity in customary security interest | 65.00% |
Senior secured revolving credit facility commitment |  | $ 750,000,000
Line of Credit Facility, Expiration Date |  | Apr. 18, 2019
Standby Letters of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Line of credit facility borrowings | $ 40,000,000 |
Swing Line Loan [Member] |  |
Debt Instrument [Line Items] |  |
Line of credit facility borrowings | $ 25,000,000 |
Accordion Debt [member] |  |
Debt Instrument [Line Items] |  |
Senior secured revolving credit facility commitment |  | $ 250,000,000
Senior Secured Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Line of credit facility borrowings |  | 162,000,000
Line of Credit Facility, Available Borrowing Capacity |  | $ 429,000,000
Line Of credit Unused Capacity Percentage |  | 72.00%
Letters of credit |  | $ 6,000,000
Casualty insurance, expiration month and year |  | 2018-07
Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Annual commitment fee range |  | 0.25%
Line of credit covenant trigger percentage |  | 25.00%
Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Annual commitment fee range |  | 0.35%
Federal Funds Rate [Member] |  |
Debt Instrument [Line Items] |  |
Base rate |  | 0.50%
London Interbank Offered Rate (LIBOR) [Member] |  |
Debt Instrument [Line Items] |  |
Base rate |  | 1.00%

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- Definition Line of credit facility covenant terms minimum asset coverage ratio. + References No definition available. + Details
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- Definition Line of credit facility covenant terms minimum interest coverage ratio. + References No definition available. + Details
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- Definition Line of credit facility covenant trigger percentage. + References No definition available. + Details
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- Definition Line of credit amount unused expressed as a percentage. + References No definition available. + Details
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- Definition Maximum debt to capitalization ratio allowable. + References No definition available. + Details
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- Definition Percentage increase in commitment fee. + References No definition available. + Details
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- Definition Percentage of equity in customary security interest. + References No definition available. + Details
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- Definition Senior secured revolving credit facility commitment. + References No definition available. + Details
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- Definition Sub facility for letters of credit. + References No definition available. + Details
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- Definition Sub facility for swing line loans. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of the total principal payments made during the annual reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: 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)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of increase (decrease) of the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Date the credit facility first became available, in CCYY-MM-DD format. + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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