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Share Based Compensation - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 director shares | Sep. 30, 2015 USD ($) | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation |  |  | $ 4,037,000 | $ 4,246,000 | $ 3,417,000
Fair value of awards granted to retirement eligible employees and expensed at date of grant |  |  | 600,000 | $ 517,000 | 760,000
Unrecognized share-based compensation expense related to non-vested equity-settled awards, restricted stock and stock options |  |  | $ 1,878,000 |  |
Weighted average period over which amount will be recognized |  |  | 1 year |  |
Shares issued out of treasury stock | shares |  |  | 300,491 | 288,089 |
Vesting of restricted stock awards and exercises of stock options, shares withheld | shares |  |  | 25,082 | 51,521 |
Payroll taxes on restricted stock and stock options |  |  | $ 222,000 | $ 762,000 |
Stock price of non-vested cash-settled awards | $ / shares |  |  | $ 13.30 |  |
Financial instruments subject to mandatory redemption, settlement terms, share value, amount, noncurrent |  | $ 17.50 |  |  |
Board of Director Fees |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation |  |  | $ 725,000 | 1,203,000 | 906,000
Cash Settled Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation |  |  | $ 717,000 | (3,127,000) | (3,710,000)
Cash Settled Awards | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Period over or after performance stock unit vest |  |  | 3 years |  |
Cash Settled Awards | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Period over or after performance stock unit vest |  |  | 4 years |  |
Stock Appreciation Rights (SARs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Period over or after performance stock unit vest |  |  | 4 years |  |
Expiration period |  |  | 10 years |  |
Fair value of awards settled in cash |  |  | $ 154,000 | 206,000 | $ 1,181,000
Fair value of vested cash-settled awards |  |  | $ 1,758,000 | $ 3,757,000 |
Granted, equivalent units | shares |  |  | 0 |  |
Cash Settled Restricted Stock Unit |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted, weighted average grant date fair value | $ / shares |  |  | $ 0.00 | $ 13.26 | $ 18.96
Fair value of awards settled in cash |  |  | $ 1,195,000 | $ 2,469,000 | $ 2,286,000
Aggregate current value of non-vested cash-settled awards |  |  | $ 555,000 |  |
Granted, equivalent units | shares |  |  | 0 |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Period over or after performance stock unit vest |  |  | 3 years |  |
Granted, equivalent units | shares |  |  | 313,000 |  |
Restricted Stock Units (RSUs) | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Period over or after performance stock unit vest |  |  | 3 years |  |
Restricted Stock Units (RSUs) | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Period over or after performance stock unit vest |  |  | 4 years |  |
Market-leveraged stock units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Period over or after performance stock unit vest |  |  | 3 years |  |
Granted, equivalent units | shares |  |  |  | 234,000 | 86,000
Number of shares to be issued if stock price increases by fifty percent | shares |  |  | 351,000 |  |
Numbers of shares to be issued if stock price decreases by fifty percent | shares |  |  | 117,000 |  |
Weighted average estimated fair value of options at grant date | $ / shares |  |  |  | $ 15.11 | $ 20.38
Performance Stock Units Psu |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Period over or after performance stock unit vest |  |  | 3 years |  |
Equity-settled awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation |  |  | $ 2,444,000 | $ 5,026,000 | $ 5,168,000
Unrecognized share-based compensation expense related to non-vested equity-settled awards, restricted stock and stock options |  |  | $ 1,106,000 |  |
Weighted average period over which amount will be recognized |  |  | 1 year |  |
Granted, weighted average grant date fair value | $ / shares |  |  | $ 9.04 |  |
Fair value of vested cash-settled awards |  |  | $ 2,884,478 | $ 4,451,000 | $ 3,119,000
Granted, equivalent units | shares |  |  | 313,000 |  |
Minimum increases in stock price |  |  | 50.00% |  |
Percentage of decrease in stock price |  |  | 50.00% |  |
Weighted average estimated fair value of options at grant date | $ / shares |  |  | $ 9.04 | $ 12.99 | $ 19.18
Special Performance | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Special performance stock unit awards to be issued | shares |  |  | 0 |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation |  |  | $ 22,000 | $ (8,000) | $ (25,000)
Period over or after performance stock unit vest |  |  | 3 years |  |
Granted, weighted average grant date fair value | $ / shares |  |  | $ 0.00 |  |
Fair value of vested cash-settled awards |  |  | $ 44,000 | 88,000 | 341,000
Granted, equivalent units | shares |  |  | 0 |  |
Minimum percent annualized return on assets vesting for stock unit awards |  |  | 1.00% |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation |  |  | $ 854,000 | 2,355,000 | 1,984,000
Unrecognized share-based compensation expense related to non-vested equity-settled awards, restricted stock and stock options |  |  | $ 772,000 |  |
Weighted average period over which amount will be recognized |  |  | 2 years |  |
Period over or after performance stock unit vest |  | 3 years | 4 years |  |
Expiration period |  | 10 years | 10 years |  |
Fair value of vested stock options |  |  | $ 0 | 0 | 21,000
Intrinsic value of options exercised |  |  | $ 61,000 | $ 0 | 568,000
Options outstanding | shares |  |  | 1,836,000 | 2,171,000 |
Weighted average exercise price | $ / shares |  |  | $ 20.25 |  |
Weighted average remaining contractual term |  |  | 5 years | 5 years |
Former Affiliated Entity | Pre Spin Stock Option Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Period over or after performance stock unit vest |  |  | 4 years |  |
Expiration period |  |  | 10 years |  |
Intrinsic value of options exercised |  |  | $ 0 | $ 24,000 | $ 352,000
Options outstanding | shares |  |  | 17,000 |  |
Weighted average exercise price | $ / shares |  |  | $ 30.56 |  |
Weighted average remaining contractual term |  |  | 1 year |  |
Long Term Incentive Compensation |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Deferred cash compensation |  |  | $ 620,000 |  |
Requisite service period (in years) |  |  | 2 years | 3 years |
Accrued liability |  |  | $ 539,000 |  |
Director |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of new directors | director | 2 |  |  |  |
Granted (in shares) | shares | 20,000 |  |  |  |
Tranche One | Director |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting, number | shares | 6,500 |  |  |  |
Tranche Two | Director |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting, number | shares |  |  | 6,500 |  |
Tranche Three | Director |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting, number | shares | 7,000 |  |  |  |

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- Definition Minimum percent annualized return on assets vesting for stock unit awards. + References No definition available. + Details
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- Definition Number of share to be issued at stock price increase. + References No definition available. + Details
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- Definition Number of shares to be issued at stock price decrease by fifty percent. + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Target Number Of Shares To Be Issued + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Number of Recipients + References No definition available. + Details
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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, 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 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: 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 Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date. + References No definition available. + Details
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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + 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 (k) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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=6415400&loc=d3e5070-113901 + Details
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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=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of exercisable share options (fully vested and expected to vest) that may be converted 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
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- Definition Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options. + References No definition available. + Details
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- Definition Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options. + References No definition available. + Details
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- Definition Period from grant date that an equity-based award expires, 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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