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Stock Incentive Plans - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Jul. 31, 2013
Installment
Jul. 31, 2012
Installment
Dec. 31, 2013
Installment
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]            
Options issued to outside consultants or advisors     0      
Number of shares of common stock reserved for issuance under the 2009 Plan     1,000,000      
Aggregate number of shares for which incentive stock options may be granted under the Plan     900,000      
Option awards shares outstanding under the 2009 plan together with the 2003 Plan and its predecessor     400,399 538,697 671,294 399,569
Outstanding options expiration period from the date of grant     10 years      
Number of equal annual installments options are exercisable     4      
Options exercisable period after date of grant     1 year      
New grants of stock options 44,970 47,500 0      
Options granted     0 0 0  
Fair value of restricted stock units, granted $ 50.28 $ 21.44        
Number of equal annual installments in which restricted stock units vest 4 4        
Annual installments for vesting of restricted stock beginning from date of grant, period 1 year 1 year        
Unrecognized compensation expense related to stock options     $ 3.8      
Weighted average period     3 years 7 months 10 days