Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Effective tax rate (as a percent)	22.80%	26.70%	21.00%	19.80%
Provision for income taxes	$ 20,000,000	$ 22,100,000	$ 34,100,000	$ 30,700,000
Tax benefit from the release of reserves for uncertain tax positions and a valuation allowance in a foreign jurisdiction	1,300,000			$ 9,100,000
Effective income tax rate excluding discrete benefits (as a percent)			21.80%	25.70%
U.S. federal statutory income tax rate (as a percent)			21.00%		35.00%
Tax cuts and jobs act, adjustments to previous estimated value	$ 0		$ 0