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Share-Based Compensation - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares issuable upon exercise of outstanding options | 3,085,888 | 2,657,723 |  | 3,781,964 | 3,900,435
Number of shares to reduce shares available to grant by upon vesting of restricted stock units | 1,712,204 | 757,871 | [1] | 598,892 | 760,183
Estimated pretax compensation expense | $ 5.0 |  |  |  |
Expiration period in years | 4 years |  |  |  |
Service period in years | 4 years |  |  |  |
Restricted stock units settled in cash exercisable in percentage | 25.00% |  |  |  |
Stock compensation and recognized liability | $ 5.6 | $ 1.4 |  | $ 4.8 |
Long-term incentive, cash-based awards | 3 years |  |  |  |
Performance unit award expenses | $ 5.4 | $ 2.1 |  | $ 3.5 |
Volatility assumptions for estimating the fair value of stock options, minimum | 66.30% |  |  |  |
Volatility assumptions for estimating the fair value of stock options, maximum | 76.80% |  |  |  |
Share-based Compensation Award, Tranche One [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock awards settled in stock exercisable in percentage | 25.00% |  |  |  |
Share-based Compensation Award, Tranche Two [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock awards settled in stock exercisable in percentage | 33.33% |  |  |  |
Share-based Compensation Award, Tranche Three [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock awards settled in stock exercisable in percentage | 33.33% |  |  |  |
Non-Employee Directors' Stock Options [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Expiration period in years | 10 years |  |  |  |
Employee stock options exercisable in percentage | 100.00% |  |  |  |
Employee Stock Option [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Expiration period in years | 10 years |  |  |  |
Service period in years | 4 years |  |  |  |
Employee Stock Option [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock awards settled in stock exercisable in percentage | 25.00% |  |  |  |
Restricted Stock Shares [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of shares to reduce shares available to grant by upon vesting of restricted stock units |  |  |  | 42,752 | 221,562
Service period in years | 4 years |  |  |  |
Restricted Stock Shares [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Service period in years | 3 years |  |  |  |
Restricted Stock Shares [Member] | Share-based Compensation Award, Tranche Two [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Service period in years | 3 years |  |  |  |
Restricted Stock Shares [Member] | Share-based Compensation Award, Tranche Three [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Service period in years | 3 years |  |  |  |
Restricted Stock Units [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of shares to reduce shares available to grant by upon vesting of restricted stock units | 1,712,204 | 757,871 | [1] | 556,140 | 538,621
Restricted Stock Units [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock awards settled in stock exercisable in percentage | 20.00% |  |  |  |
Restricted Stock Units [Member] | Share-based Compensation Award, Tranche Two [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock awards settled in stock exercisable in percentage | 50.00% |  |  |  |
Restricted Stock Units [Member] | Share-based Compensation Award, Tranche Three [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Stock awards settled in stock exercisable in percentage | 30.00% |  |  |  |
Deferred Stock Units to be Settled in Shares [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Service period in years | 3 years |  |  |  |
2016 Incentive Compensation Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Common stock subject to awards of stock options or stock appreciation rights payable in shares | 1.0 |  |  |  |
Common stock subject to any other form of award | 1.35 |  |  |  |
Common stock available for future share-based awards | 4,300,000 |  |  |  |
Shares issuable upon exercise of outstanding options | 200,000 |  |  |  |
2008 Incentive Compensation Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares issuable upon exercise of outstanding options | 2,900,000 |  |  |  |
Number of shares to reduce shares available to grant by upon vesting of restricted stock units | 1,700,000 |  |  |  |
2008 Incentive Compensation Plan [Member] | Chief Executive Officer [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Service period in years | 2 years |  |  |  |
Restricted stock units settled in cash exercisable in percentage | 50.00% |  |  |  |
Maximum [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Number of shares to reduce shares available to grant by upon vesting of restricted stock units | 100,000 |  |  |  |
[1] | The total granted awards during 2015 and total outstanding balance as of December 31, 2015 includes an adjustment of 163,566 restricted stock units. These units were previously recorded in the summary table of restricted stock units settled in cash due to the potential for cash settlement upon an involuntary, not for cause termination.

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- Definition The number that is multiplied against each share issued that are subject to awards of any stock-based compensation other than stock options and stock appreciation rights which is then subtracted from the available authorized grant pool. + References No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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