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Revolving Line of Credit - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) letters_of_credit | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Nov. 16, 2015 USD ($)
Line Of Credit Facility [Line Items] |  |  |  |
Outstanding borrowings | $ 0 | $ 10,000,000 |  |
Number of outstanding letter of credit | letters_of_credit | 1 |  |  |
Credit Agreement |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Interest paid | $ 804,000 | $ 1,900,000 | $ 223,000 |
Revolving Credit Facility | Credit Agreement |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  | $ 300,000,000
Revolving line of credit maturity date | Nov. 16, 2020 |  |  |
Debt instrument, interest rate, stated percentage | 4.75% |  |  |
Outstanding borrowings | $ 0 |  |  |
Line of credit facility, unused borrowing capacity | $ 299,500,000 |  |  |
Revolving Credit Facility | Credit Agreement | LIBOR Rate |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Debt instrument, interest rate, effective percentage | 2.78% |  |  |
Revolving Credit Facility | Credit Agreement | Minimum | Prime Commercial Lending Rate |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of credit facility interest rate | 0.25% |  |  |
Revolving Credit Facility | Credit Agreement | Minimum | LIBOR Rate |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of credit facility interest rate | 1.25% |  |  |
Revolving Credit Facility | Credit Agreement | Maximum | Prime Commercial Lending Rate |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of credit facility interest rate | 1.00% |  |  |
Revolving Credit Facility | Credit Agreement | Maximum | LIBOR Rate |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Line of credit facility interest rate | 2.00% |  |  |
Letter of Credit | Credit Agreement |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Letters of credit, outstanding | $ 500,000 |  |  |
Line of credit maturity period | 2018 |  |  |
Letter of Credit | Revolving Credit Facility | Credit Agreement |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  | $ 10,000,000

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- Definition Number of Outstanding Letter of Credit + 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 Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + 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 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 carrying value as of the balance sheet date of the noncurrent portion 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 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600 + Details
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