Annual report pursuant to Section 13 and 15(d)

Capital Stock - Additional Information (Detail)

v3.6.0.2
Capital Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stockholders Equity Note [Line Items]        
Stock options outstanding       14,584
Weighted Average Exercise Price       $ 7.63
Number of Options, Exercised     (14,584)  
Intrinsic value of options exercised     $ 296  
Tax benefit recognized on stock option exercised     $ 124  
Restricted Stock        
Stockholders Equity Note [Line Items]        
Shares of Restricted Stock, Granted 335,707 226,212 269,774  
Weighted average market value on grant dates $ 30.98 $ 42.79 $ 28.93  
Minimum forfeiture rate for restricted stock awards 0.00%      
Maximum forfeiture rate for restricted stock awards 10.00%      
Unrecognized compensation expense $ 12,328      
Remaining Compensation Expense recognition period (in years) 2 years      
Restricted Stock | Director        
Stockholders Equity Note [Line Items]        
Award vesting period for restricted stock granted 1 year      
Restricted Stock | Minimum        
Stockholders Equity Note [Line Items]        
Weighted average market value on grant dates $ 29.83      
Restricted Stock | Minimum | Employees        
Stockholders Equity Note [Line Items]        
Award vesting period for restricted stock granted 1 year      
Restricted Stock | Maximum        
Stockholders Equity Note [Line Items]        
Weighted average market value on grant dates $ 38.47      
Restricted Stock | Maximum | Employees        
Stockholders Equity Note [Line Items]        
Award vesting period for restricted stock granted 4 years      
Restricted Stock Units (RSUs)        
Stockholders Equity Note [Line Items]        
Weighted average market value on grant dates $ 29.83 $ 43.19 $ 28.54  
Unrecognized compensation expense $ 6,791      
Remaining Compensation Expense recognition period (in years) 2 years      
Number of hypothetical shares of common stock 253,661 142,917 197,515  
Percentage of IRR expected 11.00%      
Number of hypothetical shares of common stock 557,077      
Actual cumulative forfeitures (in units) 30,598      
Restricted Stock Units (RSUs) | Stock Grants 2016        
Stockholders Equity Note [Line Items]        
Stock price at the date of modification $ 37.98      
Incremental compensation expense $ 562      
Restricted Stock Units (RSUs) | Stock Grants 2013 and 2014        
Stockholders Equity Note [Line Items]        
Stock price at the date of modification   $ 33.02    
Incremental compensation expense   $ 2,460    
Restricted Stock Units (RSUs) | Stock Grants 2016        
Stockholders Equity Note [Line Items]        
Actual IRR calculated for grant 8.00%      
Restricted Stock Units (RSUs) | Minimum        
Stockholders Equity Note [Line Items]        
Expected forfeiture rate 0.00%      
Restricted Stock Units (RSUs) | Maximum        
Stockholders Equity Note [Line Items]        
Expected forfeiture rate 13.00%