Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Apr. 16, 2015	Dec. 31, 2014
Accumulated depreciation (in dollars)	$ 98,595		$ 84,579
Other assets, fair value (in dollars)	$ 5,984		$ 8,205
Treasury stock shares	169,649		0
Class A
Common stock, par value (in dollars per share)	$ 0.00001	$ 0.00001	$ 0
Common stock shares authorized	1,000,000,000		0
Common stock shares issued	38,379,858		0
Common stock shares outstanding	38,210,209		0
Class B
Common stock, par value (in dollars per share)	$ 0.00001		$ 0
Common stock shares authorized	175,000,000		0
Common stock shares issued	0		0
Common stock shares outstanding	0		0
Class C
Common stock, par value (in dollars per share)	$ 0.00001		$ 0
Common stock shares authorized	90,000,000		0
Common stock shares issued	20,976,598		0
Common stock shares outstanding	20,976,598		0
Class D
Common stock, par value (in dollars per share)	$ 0.00001		$ 0
Common stock shares authorized	175,000,000		0
Common stock shares issued	79,610,490		0
Common stock shares outstanding	79,610,490		0
Class A-1
Membership interests, authorized	0		1,964,826
Membership interests issued	0		1,964,826
Membership interests outstanding	0		1,964,826
Class A-2
Membership interests, authorized	0		101,381,332
Membership interests issued	0		101,381,332
Membership interests outstanding	0		99,855,666