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Stock Transactions and Unit Redemptions - Unit Redemption and Share Repurchase Activity (Detail) | 3 Months Ended
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Mar. 31, 2018 USD ($) $ / shares shares
Stock Transactions Parenthetical Disclosures [Abstract] |
Redemptions, Number of Units | shares | 1,723,654
Total Redemptions and Repurchases | shares | 1,723,654
Redemptions, Average Price Paid per Unit | $ / shares | $ 14.34
Total Redemptions and Repurchases | $ / shares | $ 14.34
Total Redemptions and Repurchases, Approximate Dollar Value of Units and Shares That May Yet Be Redeemed/Purchased Under the Plan | $ | $ 172,167,800

X
- Definition Average redemption price per unit. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Number of units redeemed. + References No definition available. + Details
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Namespace Prefix: | bgcp_
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Balance Type: | na
Period Type: | duration

X
- Definition Total number of limited partnership units redeemed during the period and shares repurchased during the period. + References No definition available. + Details
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Namespace Prefix: | bgcp_
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Balance Type: | na
Period Type: | duration

X
- Definition Average price of total number of limited partnership units redeemed during the period and shares repurchased during the period. + References No definition available. + Details
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Namespace Prefix: | bgcp_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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