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Schedule I - Parent Company Only - Long Term Debt - Additional Information (Detail) - USD ($) |  |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 10, 2020 | Dec. 11, 2019 | Sep. 27, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 11, 2020 | Aug. 05, 2020 | Nov. 28, 2018 | Jul. 24, 2018 | Sep. 08, 2017 | May 27, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of debt component |  |  |  | $ 1,319,784,000 | $ 1,147,649,000 |  |  |  |  |  |  |
Unsecured Credit Agreement September 8, 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayment of term loan |  |  |  |  |  | $ 195,000,000.0 |  |  |  |  |  |
Line of credit facility, outstanding amount |  |  |  |  |  | 0 |  |  |  |  |  |
5.125% Senior Notes Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000.0
Stated interest rate |  |  |  |  |  |  |  |  |  |  |  | 5.125%
5.375% Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest expense recorded |  |  |  | $ 25,600,000 | $ 25,600,000 | 11,000,000.0 |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  | $ 450,000,000.0 |  |
Stated interest rate |  |  |  | 5.375% | 5.375% |  |  |  |  | 5.375% |  |
Debt instrument, periodic interest payment description |  |  |  | payable in cash on January 24 and July 24 of each year, commencing January 24, 2019. The 5.375% Senior Notes will mature on July 24, 2023. |  |  |  |  |  |  |  |
Senior Notes maturity date |  |  |  | Jul. 24, 2023 |  |  |  |  |  |  |  |
Redemption price as percentage of principal amount |  |  |  | 101.00% |  |  |  |  |  |  |  |
Carrying amount of debt component |  |  |  | $ 446,600,000 |  |  |  |  |  | $ 444,200,000 |  |
Debt issuance costs |  |  |  |  |  |  |  |  |  | 5,800,000 |  |
3.750% Senior Notes Due October 1, 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.75% |  |  |  |  |  |  |  |  |
Parent Company [Member] | Unsecured Credit Agreement September 8, 2017 [Member] | Senior Revolving Credit and Converted Term Loan Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum revolving credit |  |  |  |  |  |  |  |  |  |  | $ 400,000,000.0 |
Credit agreement maturity date |  |  |  | Sep. 08, 2019 |  |  |  |  |  |  |  |
Interest expense recorded |  |  |  | $ 0 | $ 0 | 1,000,000.0 |  |  |  |  |  |
Parent Company [Member] | Unsecured Credit Agreement September 8, 2017 [Member] | New Senior Revolving Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit agreement maturity date |  | Feb. 26, 2021 |  | Nov. 28, 2020 |  |  |  |  |  |  |  |
Repayment of term loan |  |  |  |  |  | 195,000,000.0 |  |  |  |  |  |
Line of credit facility, outstanding amount |  |  |  | $ 0 | 68,900,000 | 0 |  |  |  |  |  |
Interest expense recorded |  |  |  | $ 5,300 | 10,000,000.0 | 300,000 |  |  |  |  |  |
Deferred financing costs |  |  |  |  | $ 1,100,000 |  |  |  |  |  |  |
Average interest rate |  |  |  | 2.88% | 3.88% |  |  |  |  |  |  |
Parent Company [Member] | Unsecured Credit Agreement September 8, 2017 [Member] | New Senior Revolving Credit Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum revolving credit |  |  |  |  |  |  |  |  |  |  | $ 400,000,000.0 |
Parent Company [Member] | Unsecured Credit Agreement September 8, 2017 [Member] | New Senior Revolving Credit Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum revolving credit |  |  |  |  |  |  |  |  | $ 350,000,000.0 |  |  |
Parent Company [Member] | Unsecured Credit Agreement September 8, 2017 [Member] | New Senior Revolving Credit Agreement [Member] | Newmark [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from notes payable |  |  |  |  |  | 195,000,000.0 |  |  |  |  |  |
Parent Company [Member] | 5.125% Senior Notes Due 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest expense recorded |  |  |  | $ 16,300,000 | $ 16,200,000 | 16,200,000 |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000.0
Debt maturity year |  |  |  | 2021 |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 5.125% |  |  |  |  |  |  |  |
Debt instrument, periodic interest payment description |  |  |  | payable in cash on May 27 and November 27 of each year, commencing November 27, 2016 |  |  |  |  |  |  |  |
Senior Notes maturity date |  |  |  | May 27, 2021 |  |  |  |  |  |  |  |
Redemption price as percentage of principal amount |  |  |  | 101.00% |  |  |  |  |  |  |  |
Carrying amount of debt component |  |  |  | $ 255,600,000 |  |  |  |  |  |  |  | 295,800,000
Debt issuance costs |  |  |  |  |  |  |  |  |  |  |  | $ 4,200,000
Parent Company [Member] | 5.125% Senior Notes Due 2021 [Member] | Cash Tender Offer [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  | $ 300,000,000.0 |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 5.125% |  |  |  |
Tendered amount on cash tender offer |  |  |  |  |  |  | $ 44,000,000.0 |  |  |  |  |
Debt instrument settlement date |  |  |  | Aug. 14, 2020 |  |  |  |  |  |  |  |
Parent Company [Member] | 5.375% Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest expense recorded |  |  |  | $ 25,500 | 25,600,000 | 11,000,000.0 |  |  |  |  |  |
Principal amount of notes |  |  |  |  |  |  |  |  |  | 450,000,000.0 |  |
Stated interest rate |  |  |  | 5.375% |  |  |  |  |  |  |  |
Debt instrument, periodic interest payment description |  |  |  | payable in cash on January 24 and July 24 of each year, commencing January 24, 2019. The 5.375% Senior Notes will mature on July 24, 2023 |  |  |  |  |  |  |  |
Senior Notes maturity date |  |  |  | Jul. 24, 2023 |  |  |  |  |  |  |  |
Redemption price as percentage of principal amount |  |  |  | 101.00% |  |  |  |  |  |  |  |
Carrying amount of debt component |  |  |  | $ 446,600,000 |  |  |  |  |  | 444,200,000 |  |
Debt issuance costs |  |  |  |  |  |  |  |  |  | $ 5,800,000 |  |
Parent Company [Member] | 3.750% Senior Notes Due October 1, 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest expense recorded |  |  |  | $ 12,100,000 | 3,200,000 | 0 |  |  |  |  |  |
Principal amount of notes |  |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 3.75% |  |  |  |  |  |  |  |
Debt instrument, periodic interest payment description |  |  |  | payable on each April 1 and October 1, commencing April 1, 2020 |  |  |  |  |  |  |  |
Senior Notes maturity date |  |  |  | Oct. 01, 2024 |  |  |  |  |  |  |  |
Redemption price as percentage of principal amount |  |  | 101.00% |  |  |  |  |  |  |  |  |
Carrying amount of debt component |  |  | $ 296,100,000 | $ 296,900,000 |  |  |  |  |  |  |  |
Debt issuance costs |  |  | $ 3,900,000 |  |  |  |  |  |  |  |  |
Parent Company [Member] | 4.375% Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest expense recorded |  |  |  | $ 6,500,000 | $ 0 | $ 0 |  |  |  |  |  |
Principal amount of notes | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 4.375% |  |  |  |  |  |  |  |
Debt instrument, periodic interest payment description |  |  |  | payable in cash on June 15 and December 15 of each year, commencing December 15, 2020. |  |  |  |  |  |  |  |
Senior Notes maturity date |  |  |  | Dec. 15, 2025 |  |  |  |  |  |  |  |
Redemption price as percentage of principal amount | 101.00% |  |  |  |  |  |  |  |  |  |  |
Carrying amount of debt component | $ 296,800,000 |  |  | $ 297,000,000.0 |  |  |  |  |  |  |  |
Debt issuance costs | $ 3,200,000 |  |  |  |  |  |  |  |  |  |  |

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