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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2015
Fair Value Disclosures [Abstract]  
Summary of Placement in the Fair Value Hierarchy of Financial Assets that are Measured at Fair Value on a Recurring Basis
The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, at March 31, 2015:
 
Quoted Prices in Active Markets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
 
March 31,
2015
Assets
 
 
 
 
 
 
 
U.S. government debt securities (Note 6)
$
—

 
$
91,238

 
$
—

 
$
91,238

Equity securities (Note 5)
277,903

 
17,019

 
—

 
294,922

Other
—

 
1,028

 
—

 
1,028

Total
$
277,903

 
$
109,285

 
$
—

 
$
387,188

The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, at December 31, 2014:
 
Quoted Prices in Active Markets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
 
December 31,
2014
Assets
 
 
 
 
 
 
 
U.S. government debt securities (Note 6)
$
—

 
$
115,335

 
$
—

 
$
115,335

Equity securities (Note 5)
143,927

 
20,962

 
—

 
164,889

Other
—

 
273

 
—

 
273

Total
$
143,927

 
$
136,570

 
$
—

 
$
280,497