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Notes Payable - Additional Information (Details)	1 Months Ended
	Jun. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Refinancing transaction amount		$ 420,000,000	$ 425,000,000
Leverage ratio		3.0
Maximum total leverage ratio in event of an acquisition		4.00
Minimum
Debt Instrument [Line Items]
Leverage ratio		3.5
Maximum
Debt Instrument [Line Items]
Leverage ratio		3.5
2018 Credit Agreement
Debt Instrument [Line Items]
Debt fees and acquisition costs		$ 4,000,000
Capitalized debt fees and acquisition costs		3,000,000
Debt fees and acquisition costs expensed in period	$ 2,000,000
Revolving Credit Facility | 2018 Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility	75,000,000
Revolving Credit Facility | 2018 Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity under credit facility	250,000,000
Letter of Credit | 2018 Credit Agreement
Debt Instrument [Line Items]
Undrawn letter of credit		16,000,000
Notes Payable | 2018 Term Loan A
Debt Instrument [Line Items]
Face amount of term loan facility	425,000,000
Refinancing transaction amount		$ 420,000,000	$ 0
Amount rolled over into new borrowing	211,000,000
Notes Payable | 2014 Term Loans
Debt Instrument [Line Items]
Debt refinanced and repaid	415,000,000
Refinancing transaction amount	415,000,000
Extinguishment of debt	$ 204,000,000

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