Stock Repurchase Plan - Additional Information (Details) - USD ($)	1 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2015	Jul. 31, 2013
2014 Repurchase Plan
Equity Class Of Treasury Stock [Line Items]
Additional authorized amount of outstanding common stock to be repurchased	$ 150,000,000
Aggregate shares repurchased		0
Remaining amount of authorized under 2014 Repurchase Plan		$ 100,000,000
2013 Repurchase Plan
Equity Class Of Treasury Stock [Line Items]
Authorized amount to repurchase outstanding common stock			$ 150,000,000