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Treasury Stock and Share Based Awards - Additional Information (Detail)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Restricted Stock  
Stockholders Equity Note [Line Items]  
Shares of Restricted Stock, Granted | shares 322,700
Market value of common stock on the dates of grant | $ / shares $ 30.68
Minimum forfeiture rate for restricted stock awards 0.00%
Maximum forfeiture rate for restricted stock awards 10.00%
Unrecognized compensation expense | $ $ 13,648
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]  
Market value of common stock on the dates of grant | $ / shares $ 29.83
Restricted Stock | Minimum | Employees  
Stockholders Equity Note [Line Items]  
Award vesting period for restricted stock granted 1 month
Restricted Stock | Maximum  
Stockholders Equity Note [Line Items]  
Market value of common stock on the dates of grant | $ / shares $ 36.46
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]  
Market value of common stock on the dates of grant | $ / shares $ 29.83
Unrecognized compensation expense | $ $ 7,354
Compensation Expense recognition period (in years) 2 years
Number of hypothetical shares of common stock issued to employees | shares 253,661
Percentage of IRR, which is the threshold 6.00%
Percentage of IRR, which is the target 8.00%
Percentage of IRR, which is the maximum 10.00%
Percentage of restricted stock units vest 100.00%
Percentage of IRR expected 9.00%
Number of hypothetical shares of common stock at assumed IRR level | shares 557,077
Actual cumulative forfeitures (in units) | shares 30,598
Incremental share based award compensation expense | $ $ 994
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 10.00%