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Treasury Stock and Share Based Awards - Additional Information (Detail) $ / shares in Units, $ in Thousands | 9 Months Ended
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Sep. 30, 2015 USD ($) $ / shares shares
Stockholders Equity Note [Line Items] |
Actual cumulative forfeitures (in units) | shares | 19,934
Restricted Stock |
Stockholders Equity Note [Line Items] |
Shares of Restricted Stock, Granted | shares | 226,212
Market value of common stock on the date of grant | $ 42.79
Minimum forfeiture rate for restricted stock awards | 0.00%
Maximum forfeiture rate for restricted stock awards | 10.00%
Unrecognized compensation expense | $ | $ 14,356
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] |
Market value of common stock on the date of grant | $ 40.75
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] |
Market value of common stock on the date of grant | $ 43.28
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] |
Unrecognized compensation expense | $ | $ 6,040
Remaining Compensation Expense recognition period (in years) | 2 years
Number of hypothetical shares of common stock | shares | 142,922
Percentage of IRR, which is the threshold | 7.50%
Percentage of IRR, which is the target | 9.50%
Percentage of IRR, which is the maximum | 11.50%
Number of hypothetical shares of common stock at assumed IRR level | shares | 544,081
Restricted Stock Units (RSUs) | 2012 Grants |
Stockholders Equity Note [Line Items] |
Assumed IRR for grant | 11.10%
Restricted Stock Units (RSUs) | Minimum |
Stockholders Equity Note [Line Items] |
Market value of common stock on the date of grant | $ 40.75
Expected forfeiture rate | 0.00%
Restricted Stock Units (RSUs) | Maximum |
Stockholders Equity Note [Line Items] |
Market value of common stock on the date of grant | $ 43.28
Expected forfeiture rate | 5.00%

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