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Capital Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stockholders Equity Note [Line Items] |  |  |
Preferred stock, shares issued | 0 |  |
Preferred stock, shares outstanding | 0 |  |
Restricted Stock |  |  |
Stockholders Equity Note [Line Items] |  |  |
Number of hypothetical shares of common stock | 246,534 |  |
Market value of common stock on the dates of grant | $ 41.70 | $ 30.98 | $ 42.79
Unrecognized compensation expense | $ 13,049 |  |
Remaining Compensation Expense recognition period (in years) | 2 years |  |
Restricted Stock | Directors |  |  |
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 | $ 34.82 |  |
Forfeiture rate for restricted stock awards | 0.00% |  |
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 dates of grant | $ 42.37 |  |
Forfeiture rate for restricted stock awards | 10.00% |  |
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] |  |  |
Number of hypothetical shares of common stock | 175,634 | 253,661 | 142,917
Market value of common stock on the dates of grant | $ 42.37 | $ 29.83 | $ 43.19
Unrecognized compensation expense | $ 6,820 |  |
Remaining Compensation Expense recognition period (in years) | 2 years |  |
Share-based compensation arrangement by share-based payment award, description | The financial performance factors are based on an implied equity value concept that determines an internal rate of return (“IRR”) for a two year measurement period, as defined in the award agreement, based on a formula utilizing a multiple of Adjusted EBITDA subject to certain specified adjustments (as defined in the restricted stock unit award agreement). |  |
Share-based compensation arrangement by share-based payment award, vesting condition | All payouts of restricted stock units that vest will be subject to an additional service requirement and will be paid in the form of common stock if the participant continues to provide services through the fourth anniversary of the grant date. |  |
Internal rate of return, performance period | 2 years |  |
Percentage of IRR expected | 11.00% |  |
Expected forfeiture rate | 5.00% |  |
Number of hypothetical shares of common stock at maximum IRR level | 628,189 |  |
Actual cumulative forfeitures (in units) | 7,407 |  |
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 2015 |  |  |
Stockholders Equity Note [Line Items] |  |  |
Stock price at the date of modification |  | $ 37.98 |
Incremental compensation expense |  | $ 562 |
Restricted Stock Units (RSUs) | Stock Grants 2016 |  |  |
Stockholders Equity Note [Line Items] |  |  |
Actual IRR calculated for grant | 8.00% |  |
Restricted Stock Units (RSUs) | Stock Grants 2017 |  |  |
Stockholders Equity Note [Line Items] |  |  |
Actual IRR calculated for grant | 9.50% |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition General descriptive information regarding an arrangement under which employees and directors receive: (a) awards of equity shares, equity share options, or other equity instruments; or (b) the entity incurs liabilities to them: (1) in amounts based, at least in part, on the price of the entity's shares or other equity instruments; or (2) that require or may require settlement by issuance of the entity's shares. Such an arrangement is usually provided to employees and directors to compensate them, provide performance incentives to them, and to attract or retain their services. May also include pertinent information particular to a plan that is not elsewhere specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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