Earnings Per Share - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Feb. 12, 2013
Earnings Per Share Disclosure [Line Items]
Common stock equivalents not included in computation of diluted earnings per share (in shares)	1,114,041
Preferred stock, shares authorized (in shares)	15,000,000
Preferred stock, shares issued (in shares)	0
Payment for repurchase of common stock	$ 0	$ 150,000	$ 582,298
Shares available for repurchase	3,749,340
Common Stock
Earnings Per Share Disclosure [Line Items]
Shares repurchased (in shares)		2,190,254	9,198,056
Maximum
Earnings Per Share Disclosure [Line Items]
Stock repurchase program, number of shares authorized to be repurchased (in shares)				15,000,000
Accelerated Share Repurchase Agreement
Earnings Per Share Disclosure [Line Items]
Shares repurchased (in shares)		2,190,254	7,064,932
Payment for repurchase of common stock		$ 150,000	$ 450,000
Restricted Stock
Earnings Per Share Disclosure [Line Items]
Number of shares containing nonforfeitable rights to dividends (in shares)	9,250