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Debt and Short-Term Borrowings - Additional Information (Detail) - USD ($) | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2016 | May 31, 2016 | Apr. 17, 2013
Debt Instrument [Line Items] |  |  |  |  |  |
Losses reclassified from accumulated other comprehensive loss into income | $ 100,000 |  |  |  |  |
Gains expected to be reclassified from accumulated other comprehensive loss into income in the next 12 months | 500,000 |  |  |  |  |
Notes Payable |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Non interest bearing financing agreement |  |  |  | $ 1,100,000.0 | $ 700,000.0 |
Note payable | 400,000 | $ 1,000,000 |  |  |  |
Term A due on April 17, 2018 | Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum amount under credit facilities |  |  | $ 250,000,000 |  |  | $ 300,000,000.0
Term A due on April 17, 2018 | Credit Facility | Maturity not extended |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum amount under credit facilities |  |  | 30,000,000 |  |  |
2013 Credit Agreement, Term B Loan | Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum amount under credit facilities |  |  |  |  |  | 400,000,000.0
2013 Credit Agreement, Revolving Facility | Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum amount under credit facilities |  |  |  |  |  | $ 100,000,000.0
Term A due on January 17, 2020 | Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured credit facilities | 191,400,000 |  |  |  |  |
Term A due on January 17, 2020 | Credit Facility | Maturity extended |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum amount under credit facilities |  |  | 219,000,000 |  |  |
Term B due on April 17, 2020 | Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured credit facilities | 379,000,000 |  |  |  |  |
Senior Secured Revolving Credit Facility | Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum amount under credit facilities |  |  | 100,000,000 |  |  |
Additional borrowing capacity available under the Revolving Facility | $ 65,000,000 |  |  |  |  |
Senior Secured Revolving Credit Facility | Credit Facility | Maturity extended |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum amount under credit facilities |  |  | 65,000,000 |  |  |
Senior Secured Revolving Credit Facility | Credit Facility | Maturity not extended |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum amount under credit facilities |  |  | $ 35,000,000 |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + 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://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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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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