Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Change in tax rate, provisional Income tax expense (benefit)	$ 0		$ (26,900,000)
Income tax provision (benefit)	$ (7,280,000)	$ 24,299,000
Effective income tax rate	20.20%	37.20%
Valuation allowance	$ 11,800,000		$ 10,500,000
Unrecognized tax benefits	25,500,000
Unrecognized tax benefits that would impact the Company's effective tax rate	2,900,000
Unrecognized tax benefits that would impact goodwill	22,600,000
Unrecognized tax benefits, income tax penalties expense	0
Unrecognized tax benefits, interest on income taxes expense	400,000
Unrecognized tax benefits, income tax penalties accrued	8,900,000
Unrecognized tax benefits, interest on income taxes accrued	$ 6,400,000