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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2011
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Performance stock units granted                 0        
Stock options, granted                 0        
Stock options exercisable over the next twelve months                 114,227        
Weighted average remaining contractual life of options outstanding                 5 years 8 months 23 days        
Unvested compensation cost related to stock options                 $ 14        
Unvested compensation cost related to stock options recognized as expense                 2 months        
Granted (in dollars per share)                 $ 0.00 $ 0.00      
Shares available for future issuance under equity compensation plans                 2,303,428        
Proceeds and Excess Tax Benefit from Share-based Compensation                 $ 274 $ 4,323 $ 1,268    
Incentive Compensation Plans 2001, 2006, 2010, 2014                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Expiration period (in years)                 10 years        
Nonqualified Stock Option Plan 2002                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Expiration period (in years)                 10 years        
Vesting period (in years)                 1 year        
Long-Term Incentive Plan 2011- 2013                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Performance stock units granted           311,670              
Long-Term Incentive Plan 2012- 2014                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Performance stock units granted         589,934                
Long-Term Incentive Plan 2013- 2015                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Performance stock units granted       330,639                  
Long Term Incentive Plan 2014-2016                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Performance stock units granted     380,064                    
Stock options                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Performance stock units granted                   0      
Granted (in dollars per share)                     $ 12.26    
Stock options | Long-Term Incentive Plan 2012- 2014                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent)         33.33%                
Stock options | Long-Term Incentive Plan 2013- 2015                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent)       33.33%                  
Stock options | Long Term Incentive Plan 2014-2016                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent)     33.33%                    
Restricted stock units                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Vesting period (in years)                 3 years        
Restricted Stock Units (RSUs)                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Unvested compensation cost related to stock options                 $ 1,904        
Unvested compensation cost related to stock options recognized as expense                 26 months        
Number of RSU's granted                 143,169        
Number of shares vested                 93,440 93,017      
Granted (in dollars per share)                 $ 36.02 $ 36.35 27.53    
Restricted Stock Units (RSUs) | Long Term Incentive Plan 2015-2017                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock options, granted   105,102                      
Restricted Stock Units (RSUs) | Long Term Incentive Plan 2016 - 2018                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Stock options, granted 106,287                        
Performance stock units                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Unvested compensation cost related to stock options                 $ 1,007        
Unvested compensation cost related to stock options recognized as expense                 17 months        
Granted (in dollars per share)                 $ 36.76 $ 36.62 $ 23.96    
Performance stock units | Long-Term Incentive Plan 2012- 2014                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested                         91,190
Number of performance units, earned                         309,890
Performance stock units | Long-Term Incentive Plan 2012- 2014 | Vesting Period 2013                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested                       86,170  
Performance stock units | Long-Term Incentive Plan 2012- 2014 | Vesting Period 2014                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested                     131,488    
Performance stock units | Long-Term Incentive Plan 2013- 2015                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested                       9,821  
Number of performance units, earned                       33,405  
Performance stock units | Long-Term Incentive Plan 2013- 2015 | Vesting Period 2014                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested                     13,373    
Performance stock units | Long-Term Incentive Plan 2013- 2015 | Vesting Period 2015                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested                   8,701      
Performance stock units | Long Term Incentive Plan 2014-2016                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested                     49,248    
Number of performance units, earned                     123,788    
Performance stock units | Long Term Incentive Plan 2014-2016 | Vesting Period 2015                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested                   32,074      
Performance stock units | Long Term Incentive Plan 2014-2016 | Vesting Period 2016                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested                 38,091        
Performance stock units | Long Term Incentive Plan 2015-2017                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested                   69,912      
Number of performance units, earned                   231,543      
Performance stock units | Long Term Incentive Plan 2015-2017 | Vesting Period 2016                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested                 83,371        
Performance stock units | Long Term Incentive Plan 2015-2017 | Vesting Period 2017                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested                 67,705        
Performance stock units | Long Term Incentive Plan 2016 - 2018                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested                 55,570        
Number of performance units, earned                 179,865        
Share-based Compensation Award, Tranche One | Stock options | Long-Term Incentive Plan 2011- 2013                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent)           33.33%              
Share-based Compensation Award, Tranche One | Restricted Stock Units (RSUs) | Long Term Incentive Plan 2015-2017                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent)   33.33%                      
Share-based Compensation Award, Tranche One | Restricted Stock Units (RSUs) | Long Term Incentive Plan 2016 - 2018                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent) 33.33%                        
Share-based Compensation Award, Tranche Two | Stock options | Long-Term Incentive Plan 2011- 2013                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent)           33.33%              
Share-based Compensation Award, Tranche Two | Stock options | Long-Term Incentive Plan 2012- 2014                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent)         33.33%                
Share-based Compensation Award, Tranche Two | Stock options | Long-Term Incentive Plan 2013- 2015                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent)       33.33%                  
Share-based Compensation Award, Tranche Two | Stock options | Long Term Incentive Plan 2014-2016                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent)     33.33%                    
Share-based Compensation Award, Tranche Two | Restricted Stock Units (RSUs) | Long Term Incentive Plan 2015-2017                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent)   33.33%                      
Share-based Compensation Award, Tranche Two | Restricted Stock Units (RSUs) | Long Term Incentive Plan 2016 - 2018                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent) 33.33%                        
Share-based Compensation Award, Tranche Three | Stock options | Long-Term Incentive Plan 2011- 2013                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent)           33.33%              
Share-based Compensation Award, Tranche Three | Stock options | Long-Term Incentive Plan 2012- 2014                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent)         33.33%                
Share-based Compensation Award, Tranche Three | Stock options | Long-Term Incentive Plan 2013- 2015                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent)       33.33%                  
Share-based Compensation Award, Tranche Three | Stock options | Long Term Incentive Plan 2014-2016                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent)     33.33%                    
Share-based Compensation Award, Tranche Three | Restricted Stock Units (RSUs) | Long Term Incentive Plan 2015-2017                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent)   33.33%                      
Share-based Compensation Award, Tranche Three | Restricted Stock Units (RSUs) | Long Term Incentive Plan 2016 - 2018                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Shares vested (as a percent) 33.33%                        
Subsequent Event | Performance stock units | Long Term Incentive Plan 2016 - 2018 | Vesting Period 2016                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested               46,139          
Subsequent Event | Performance stock units | Long Term Incentive Plan 2016 - 2018 | Vesting Period 2017                          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Number of shares vested             49,252