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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
Mar. 31, 2014
Mar. 31, 2013
Investments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance $ 5,946 $ 12,954
Total Realized and Unrealized Gains (Losses) (169) 329
Purchases and Issuances 4,052   
Sales and Settlements (503) (504)
Transfers In (Out) (620)   
Ending Balance 8,706 12,779
Interest Rate Lock Commitments [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance 2,375  
Total Realized and Unrealized Gains (Losses) 663  
Purchases and Issuances     
Sales and Settlements     
Transfers In (Out)     
Ending Balance 3,038  
Beginning Balance 3,653  
Total Realized and Unrealized Gains (Losses) (749)  
Purchases and Issuances     
Sales and Settlements     
Transfers In (Out)     
Ending Balance 4,402  
Auction Rate Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance 85,124 72,118
Total Realized and Unrealized Gains (Losses) 1 (690)
Purchases and Issuances 3,200 4,250
Sales and Settlements (3,300) (3,125)
Transfers In (Out)      
Ending Balance 85,025 72,553
Beginning Balance   100
Total Realized and Unrealized Gains (Losses)     
Purchases and Issuances     
Sales and Settlements     
Transfers In (Out)     
Ending Balance   100
Auction Rate Securities Commitments to Purchase [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance 2,600 2,647
Total Realized and Unrealized Gains (Losses) 395 553
Purchases and Issuances      
Sales and Settlements      
Transfers In (Out)      
Ending Balance 2,205 2,094
Mortgage and Other Asset-Backed Securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance   40
Total Realized and Unrealized Gains (Losses)   7
Purchases and Issuances   23
Sales and Settlements   (18)
Transfers In (Out)     
Ending Balance   52
Municipal Obligations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning Balance 236 239
Total Realized and Unrealized Gains (Losses) (166)   
Purchases and Issuances      
Sales and Settlements      
Transfers In (Out)      
Ending Balance $ 70 $ 239