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Stock-Based Compensation - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Activity [Line Items]    
Holding period of restricted stock available to executives 4 years  
Share based compensation arrangement long-term retention program restricted stock available to executive releasing period 10 years  
Number of days considered for weighted average trading price 20 days  
Percentage of annual retainers 60.00%  
Percentage of additional annual retainers 100.00%  
Stock Option Plan 2009 [Member]
    
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Activity [Line Items]    
Maximum number of shares, issued under the option plan 16,000,000  
Number of shares available to be granted 7,516,831 8,457,666
Period of granted option 7 years  
Option vested under stock option plan to employees and consultants One-third on each of the first three anniversaries of the date of grant.  
Stock Option Plan 1987 [Member]
    
Schedule Of Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Activity [Line Items]    
Period of granted option 7 years