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Treasury Stock and Share Based Awards - Additional Information (Detail) $ / shares in Units, $ in Thousands | 6 Months Ended
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Jun. 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 | $ 30.90
Minimum forfeiture rate for restricted stock awards | 0.00%
Maximum forfeiture rate for restricted stock awards | 10.00%
Unrecognized compensation expense | $ | $ 16,244
Compensation Expense recognition period (in years) | 3 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 | $ | $ 7,759
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 | 418,879
Actual cumulative forfeitures (in units) | shares | 20,686
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%

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