Other Assets - Summary of Non Current Other Assets (Detail) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Other Assets [Abstract]
Equity method investments		$ 104,718	$ 101,562
Deferred tax assets	[1]	166,804	168,594
Cost method investments		13,580	6,005
Other		2,406	2,299
Total other non-current assets		$ 287,508	$ 278,460

[1] Deferred tax assets and liabilities are recognized for the future tax consequences attributable to basis differences between the carrying amounts of existing assets and liabilities and their respective tax basis. Accordingly, a deferred tax asset of $108.6 million has been contributed to Newmark for the year ended December 31, 2017 for the basis difference between BPF’s net assets and its tax basis.