Schedule I - Parent Company Only Financial Statements - Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 191,448	$ 163,564
Total current assets	1,819,072	1,073,530
Other assets	322,922	407,898
Total assets	3,982,450	3,201,599
Current liabilities:
Total current liabilities	1,705,292	1,045,387
Long-term debt	680,385	589,294
Total liabilities	3,041,258	2,239,457
Total stockholders’ equity	655,049	599,664
Total liabilities, redeemable partnership interests, and equity	3,982,450	3,201,599
NEWMARK Group Inc Parent
Current assets:
Cash and cash equivalents	76	101
Total current assets	76	101
Investment in subsidiaries	501,373	543,412
Receivables from related parties	680,385	589,294
Other assets	188,248	179,813
Total assets	1,370,082	1,312,620
Current liabilities:
Accounts payable and accrued expenses	30,718	74,564
Payable to related parties	3,930	49,098
Total current liabilities	34,648	123,662
Long-term debt	680,385	589,294
Total liabilities	715,033	712,956
Total stockholders’ equity	655,049	599,664
Total liabilities, redeemable partnership interests, and equity	$ 1,370,082	$ 1,312,620