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Acquisitions - Additional Information (Detail) $ in Thousands	1 Months Ended						3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2019 USD ($)	Apr. 30, 2019	Dec. 31, 2018 USD ($)	Sep. 30, 2018	Jul. 31, 2018 Office	Apr. 30, 2018 Office	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Business acquisition, contingent cash consideration	$ 27,195		$ 28,099				$ 27,195	$ 27,195	$ 28,099
Additional goodwill recognized	$ 543,125		$ 515,321				543,125	543,125	515,321	$ 477,532
Business acquisition, aggregate revenue contribution							1,700	1,700	28,500
MLG Commercial LLC [Member]
Business Acquisition [Line Items]
Business acquisition date		Apr. 30, 2019
ACRES [Member]
Business Acquisition [Line Items]
Business acquisition date	Jun. 30, 2019
Two Thousand Nineteen Acquisitions [Member]
Business Acquisition [Line Items]
Total consideration transferred								31,900
Business acquisition, contingent cash consideration	$ 7,800						7,800	7,800
Additional goodwill recognized	27,798						27,798	27,798
Business acquisition, amount deductible for tax	18,800						18,800	$ 18,800
Two Thousand Nineteen Acquisitions [Member] | Newmark Holdings, L.P. [Member] | Limited Partnership Units [Member]
Business Acquisition [Line Items]
Business acquisition price paid (Partnership Units) | shares								233,779
Business acquisition, contingent non cash consideration, fair value	$ 1,900						$ 1,900	$ 1,900
Boston and Pittsburg Acquisitions [Member]
Business Acquisition [Line Items]
Business acquisition date						Apr. 30, 2018
Number of offices acquired | Office						2
Denver and Pasadena Acquisitions [Member]
Business Acquisition [Line Items]
Business acquisition date					Jul. 31, 2018
Number of offices acquired | Office					2
RKF Retail Holdings LLC Acquisitions [Member]
Business Acquisition [Line Items]
Business acquisition date				Sep. 30, 2018
MiT National Land Services LLC Acquisitions [Member]
Business Acquisition [Line Items]
Business acquisition date			Dec. 31, 2018
Two Thousand Eighteen Acquisitions [Member]
Business Acquisition [Line Items]
Total consideration transferred									62,900
Business acquisition, contingent cash consideration			$ 8,600						8,600
Additional goodwill recognized			42,188						42,188
Business acquisition, amount deductible for tax			28,600						$ 28,600
Two Thousand Eighteen Acquisitions [Member] | Restricted Stock [Member]
Business Acquisition [Line Items]
Business acquisition price paid (Partnership Units) | shares									216,900
Business acquisition, contingent non cash consideration, fair value			3,100						$ 3,100
Two Thousand Eighteen Acquisitions [Member] | Newmark Holdings, L.P. [Member] | Limited Partnership Units [Member]
Business Acquisition [Line Items]
Business acquisition price paid (Partnership Units) | shares									465,316
Business acquisition, contingent non cash consideration, fair value			$ 6,200						$ 6,200

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