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Stock-Based Compensation (Tables) (Restricted stock [Member])
 3 Months Ended
Mar. 31, 2015
Restricted stock [Member]
  
Summary of Changes in Non-vested Shares of Restricted Stock Outstanding
A summary of changes in non-vested restricted shares outstanding for the three months ended March 31, 2015 is presented below: 
 
 
Number of
non-vested
shares
 
Weighted
average
grant-date
fair value
Non-vested restricted shares outstanding at December 31, 2014
 
2,678,764

 
$
49.40

Granted
 
1,233,574

 
47.91

Vested
 
(180,733
)
 
51.28

Forfeited
 
(54,576
)
 
53.67

Non-vested restricted shares outstanding at March 31, 2015
 
3,677,029

 
$
48.74