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Stock-Based Compensation Plans - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 1996
1996 Incentive Plan [Member]
Dec. 31, 1997
1997 Incentive Plan [Member]
Dec. 31, 1999
1999 Incentive Plan [Member]
Dec. 31, 2007
Two Thousand Two Stock Incentive Plan [Member]
Dec. 31, 2003
Two Thousand Two Stock Incentive Plan [Member]
Dec. 31, 2002
Two Thousand Two Stock Incentive Plan [Member]
Dec. 31, 2013
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2013
Restricted Stock [Member]
Employees [Member]
Dec. 31, 2013
Restricted Stock [Member]
Outside Directors [Member]
Dec. 31, 2013
Restricted Stock [Member]
Minimum [Member]
Dec. 31, 2012
Restricted Stock [Member]
Minimum [Member]
Dec. 31, 2011
Restricted Stock [Member]
Minimum [Member]
Dec. 31, 2013
Restricted Stock [Member]
Maximum [Member]
Dec. 31, 2012
Restricted Stock [Member]
Maximum [Member]
Dec. 31, 2011
Restricted Stock [Member]
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Shares reserved under long-term incentive plan           1,800,000 600,000 2,400,000 1,000,000 2,000,000 2,400,000                      
Restricted stock vesting period       3 years 5 years                       3 years 3 years 3 years 5 years 5 years 5 years
Shares available for future grant 929,623                                          
Compensation expense related to share-based compensation plans $ 7,667,000 $ 6,539,000 $ 4,788,000                                      
Compensation expense related to share-based compensation plans, et tax 4,600,000 4,000,000 3,000,000                                      
Total intrinsic value of options exercised 600,000 1,200,000 1,100,000                                      
Proceeds from stock options exercised 41,000 69,000 86,000                                      
Tax benefit from stock options exercised 200,000 500,000 700,000                                      
Total fair value of restricted shares vested 7,500,000 5,400,000 4,700,000                                      
Unrecognized compensation cost related to non-vested share-based compensation $ 18,100,000                                          
Unrecognized compensation cost weighted average period recognized (years) 2 years 10 months 2 days                                          
Restricted stock grants 300,900                     300,900 296,017 258,284 249,773 20,000            
Restricted stock grants, Weighted average grant date fair value $ 34.64                     $ 34.64 $ 32.62 $ 35.27