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Capital Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Stockholders Equity Note [Line Items] |  |  |
Intrinsic value of options exercised |  | $ 296 | $ 168
Tax benefit recognized on stock option exercised |  | $ 124 | $ 71
Restricted Stock |  |  |
Stockholders Equity Note [Line Items] |  |  |
Shares of Restricted Stock, Granted | 226,212 | 269,774 | 271,532
Weighted average grant date fair value per share | $ 42.79 | $ 28.93 | $ 30.09
Minimum forfeiture rate for restricted stock awards | 0.00% |  |
Maximum forfeiture rate for restricted stock awards | 10.00% |  |
Unrecognized compensation expense | $ 11,944 |  |
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 grant date fair value per share | $ 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] |  |  |
Weighted average grant date fair value per share | $ 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] |  |  |
Weighted average grant date fair value per share | $ 43.19 | $ 28.54 | $ 29.44
Remaining Compensation Expense recognition period (in years) | 2 years |  |
Number of hypothetical shares of common stock | 142,917 | 197,515 | 115,107
Percentage of IRR, which is the threshold | 8.50% |  |
Percentage of IRR, which is the target | 10.50% |  |
Percentage of IRR, which is the maximum | 12.50% |  |
Percentage of IRR expected | 11.00% |  |
Stock price at the date of modification | $ 33.02 |  |
Incremental compensation expense | $ 2,460 |  |
Number of hypothetical shares of common stock | 544,076 |  |
Actual cumulative forfeitures (in units) | 22,985 |  |
Unrecognized Compensation expense related to outstanding restricted stock | $ 6,600 |  |
Restricted Stock Units (RSUs) | 2012 Grants |  |  |
Stockholders Equity Note [Line Items] |  |  |
Actual IRR calculated for grant | 11.10% |  |
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 | 5.00% |  |

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