Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Assets:
Basis adjustments	$ 727,696	$ 598,607
Compensation and benefits	204,780	258,976
Net operating loss and tax credit carryforwards	309,811	283,198
Depreciation and amortization	840	950
Other	36,154	36,470
Gross deferred tax assets	1,279,281	1,178,201
Valuation allowance	(89,251)	(1,044,152)	$ (1,225,305)	$ (1,238,765)
Deferred tax assets (net of valuation allowance)	1,190,030	134,049
Deferred Tax Liabilities:
Depreciation and amortization	17,629	21,908
Compensation and benefits	9,332	28,035
Goodwill	15,208	15,289
Other	28,370	39,705
Deferred tax liabilities	70,539	104,937
Net deferred tax assets	$ 1,119,491	$ 29,112