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Long-Term Debt and Long-Term Debt Payable to Related Parties - Additional Information (Detail) - USD ($) |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Dec. 13, 2017 | Sep. 08, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Converted Term Loan [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum revolving credit |  |  |  | $ 400,000,000 |  |  |
Credit agreement maturity date |  |  |  |  | Sep. 08, 2019 |  |
Line of credit facility, description |  |  |  |  | Borrowings under the Converted Term Loan bear interest at either LIBOR or a defined base rate plus an additional margin, which ranges from 50 basis points to 325 basis points depending on BGC’s debt rating as determined by S&P and Fitch and whether such loan is a LIBOR loan or a base rate loan. Since there were amounts outstanding under the term loan facility as of December 31, 2017, the pricing increased by 50 basis points until the term loan facility is paid in full, and if there are any amounts outstanding under the term loan facility as of June 30, 2018, the pricing shall increase by an additional 75 basis points (125 basis points in the aggregate) until the term loan facility is paid in full. From and after the repayment in full of the term loan facility, the pricing shall return to the levels previously described |  |
Stated Spread to One Month LIBOR |  | 0.50% |  |  |  |  |
Debt instrument gross amount |  | $ 400,000,000 |  |  | $ 400,000,000 |  | $ 400,000,000
Current interest rate |  |  |  |  | 3.99% |  |
Interest expense |  |  |  |  | $ 4,600,000 | $ 0 |
Converted Term Loan [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated Spread to One Month LIBOR | 0.75% |  |  |  |  |  |
Converted Term Loan [Member] | LIBOR or Defined Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated Spread to One Month LIBOR |  |  |  | 0.50% |  |  |
Converted Term Loan [Member] | LIBOR or Defined Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated Spread to One Month LIBOR |  |  |  | 3.25% |  |  |
Term Loan [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum revolving credit |  |  |  | $ 575,000,000 |  |  |
Credit agreement maturity date |  |  |  |  | Sep. 08, 2019 |  |
Line of credit facility, description |  |  |  |  | Borrowings under the Term Loan bear interest at either LIBOR or a defined base rate plus an additional margin which ranges from 50 basis points to 325 basis points depending on BGC’s debt rating as determined by S&P and Fitch and whether such loan is a LIBOR loan or a base rate loan. Since there were amounts outstanding under the term loan facility as of December 31, 2017, the pricing increased by 50 basis points until the term loan facility is paid in full and if there are any amounts outstanding under the term loan facility as of June 30, 2018, the pricing shall increase by an additional 75 basis points (125 basis points in the aggregate) until the term loan facility is paid in full. From and after the repayment in full of the term loan facility, the pricing shall return to the levels previously described. |  |
Stated Spread to One Month LIBOR |  | 0.50% |  |  |  |  |
Interest expense |  |  |  |  | $ 2,600,000 |  |
Percentage of net cash proceeds of all material asset sales |  |  |  | 100.00% |  |  |
Repayments of credit agreement |  |  | $ 304,300,000 |  | 270,700 |  |
Line of credit facility, outstanding amount |  |  |  |  | 0 |  |
Term Loan [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated Spread to One Month LIBOR | 0.75% |  |  |  |  |  |
Term Loan [Member] | LIBOR or Defined Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated Spread to One Month LIBOR |  |  |  | 0.50% |  |  |
Term Loan [Member] | LIBOR or Defined Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated Spread to One Month LIBOR |  |  |  | 3.25% |  |  |
2019 Promissory Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument gross amount |  |  | 300,000,000 |  |  |  |
Interest expense |  |  |  |  | $ 4,300,000 |  | 800,000
Maturity date |  |  |  |  | Dec. 09, 2019 |  |
2042 Promissory Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument gross amount |  |  | $ 112,500,000 |  |  |  |
Interest expense |  |  |  |  | $ 2,300,000 |  | $ 500,000
Maturity date |  |  |  |  | Jun. 26, 2042 |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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 Date when the debt instrument is scheduled to be fully repaid, 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 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Aggregate amount of interest paid or due on all long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.8) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + 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 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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