Share Repurchase Program - Additional Information (Details)	9 Months Ended
	Sep. 30, 2017 USD ($)	Nov. 04, 2017 USD ($)
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, expiration date	Nov. 04, 2017
Stock repurchase program, authorized amount	$ 75,000,000
Stock repurchase program, remaining authorized repurchase amount	$ 25,700,000
Line of credit facility, conditions for the elimination of limits on shares repurchases, leverage ratio	3.25
Scenario Forecast
Equity Class Of Treasury Stock [Line Items]
Stock repurchase program, authorized amount		$ 100,000,000