Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Increase in valuation allowance related to changes in the estimated tax benefit of federal and state operating losses of separate-return entities	$ 9,192
Liability for unrecognized tax benefits	40,382	$ 32,776	$ 24,066
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	37,538
Increase in liability for unrecognized tax benefits	7,606
Accrued interest and penalties related to unrecognized tax benefits, net of federal tax benefits	9,019	$ 4,195
Domestic Tax Authority
Income Taxes [Line Items]
Net operating loss carryforwards	124,935
State
Income Taxes [Line Items]
Net operating loss carryforwards	459,558
Foreign Tax Authority
Income Taxes [Line Items]
Net operating loss carryforwards	$ 186,757