Stock Repurchase Plan - Additional Information (Details) - USD ($)	6 Months Ended
	Jun. 30, 2016	Oct. 31, 2015
Equity Class Of Treasury Stock [Line Items]
Total cost of shares repurchased	$ 54,900,000
2015 Repurchase Plan
Equity Class Of Treasury Stock [Line Items]
Authorized amount of outstanding common stock to be repurchased		$ 250,000,000
Total cost of shares repurchased	54,900,000
Remaining amount of authorized under 2015 Repurchase Plan	$ 149,000,000