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Financial Instruments - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value $ 3,188 $ 0 $ 3,188 $ 0 $ 3,833 $ 3,653   $ 100
Total Realized and Unrealized Gains (Losses) 645   465          
Purchases and Issuances       100        
Investments [Member]
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Beginning Balance     5,946 12,954 8,779   12,974  
Total Realized and Unrealized Gains (Losses) (254) (413) (341) 210        
Purchases and Issuances 180 1,000 4,444 1,000        
Sales and Settlements (282) (7,435) (1,006) (8,038)        
Transfers In (Out) 0 0 (620) 0        
Ending Balance 8,423 6,126 8,423 6,126 8,779   12,974  
Interest Rate Lock Commitments [Member]
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Beginning Balance     2,375   10,528      
Total Realized and Unrealized Gains (Losses) (5,017)   3,136          
Ending Balance 5,511   5,511   10,528      
Auction Rate Securities [Member]
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Beginning Balance     85,124 72,118 92,548   78,076  
Total Realized and Unrealized Gains (Losses) (645) (245) (971) (437)        
Purchases and Issuances 2,375 2,750 16,550 13,175        
Sales and Settlements (6,955) (150) (13,380) (4,425)        
Ending Balance 87,323 80,431 87,323 80,431 92,548   78,076  
Auction Rate Securities Purchase Commitment [Member]
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 1,037 2,412 1,037 2,412 1,514 2,600 2,329 2,647
Total Realized and Unrealized Gains (Losses) 477 (83) 1,563 235        
Mortgage and Other Asset-Backed Securities [Member]
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Beginning Balance       40     67  
Total Realized and Unrealized Gains (Losses)   0   0        
Purchases and Issuances   0   0        
Sales and Settlements   (8)   (8)        
Transfers In (Out)   (59)   (32)        
Ending Balance   0   0     67  
Municipal Obligations [Member]
                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Beginning Balance     236 239 52   236  
Total Realized and Unrealized Gains (Losses) 77 0 (107) (3)        
Purchases and Issuances   0   0        
Sales and Settlements   0   0        
Ending Balance $ 129 $ 236 $ 129 $ 236 $ 52   $ 236