v3.8.0.1

Capital Stock - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) $ / shares shares | Jun. 30, 2014 $ / shares | Mar. 31, 2014 $ / shares | Dec. 31, 2016 USD ($) vote $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Nov. 30, 2015 $ / shares
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 100,000,000 |  |  | 100,000,000 | 100,000,000 |  |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.01 |  |  | $ 0.01 | $ 0.01 |  |
Common stock, shares authorized (in shares) | 300,000,000 |  |  | 300,000,000 | 300,000,000 |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.01 |  |  |  | $ 0.01 |  |
Preferred stock, shares issued (in shares) | 0 |  |  | 0 | 0 |  |
Preferred stock, shares outstanding (in shares) | 0 |  |  | 0 | 0 |  |
Dividend rate (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.12
Minimum percentage of Common Stock |  |  |  | 15.00% |  |  |
Conversion basis (in shares) |  |  |  | 1 |  |  |
Weighted-average grant date fair value of stock options granted (in dollars per share) | $ / shares |  |  |  | $ 3.74 | $ 5.39 | $ 4.25 |
Stock based compensation expense | $ |  |  |  | $ 872,000 | $ 692,000 | $ 1,233,000 |
Employee Stock Option [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Unrecognized compensation cost related to non-vested stock options granted | $ | $ 200,000 |  |  | 200,000 | 200,000 | 100,000 |
Stock based compensation expense | $ |  |  |  | 100,000 | 100,000 | $ 200,000 |
Intrinsic value of outstanding in-the-money stock options | $ | 800,000 |  |  | 0 | 800,000 |  |
Intrinsic value of exercisable stock options | $ | $ 500,000 |  |  | $ 0 | $ 500,000 |  |
Weighted-average remaining life of options vested and expected to vest |  |  |  | 8 years 6 months | 8 years 7 months 6 days |  |
Exercisable stock options with weighted-average remaining life |  |  |  | 8 years 3 months 18 days | 8 years 2 months 12 days |  |
Equity Option [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Exercise price of stock options granted (in dollars per share) | $ / shares |  |  |  | $ 3.74 | $ 5.39 | $ 4.16 |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Share-based compensation expense recorded in general and administrative expenses | $ |  |  |  | $ 1,400,000 | $ 1,400,000 | $ 1,200,000 |
Restricted stock units vested (in shares) |  |  |  | 400,000 | 400,000 |  |
Market value of restricted stock units | $ |  |  |  | $ 1,500,000 | $ 2,300,000 |  |
2007 Long-Term Incentive Plan [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Weighted-average grant date fair value of stock options granted (in dollars per share) | $ / shares |  | $ 1.38 | $ 1.37 | $ 0.87 | $ 1.97 |  |
Expected volatility rate |  | 46.00% | 47.70% | 51.30% | 49.00% |  |
Expected life |  | 5 years |  | 5 years | 5 years |  |
Dividend yield |  | 2.80% |  | 7.80% | 2.10% |  |
Risk-free interest rate |  | 1.60% | 2.90% | 1.20% | 1.40% |  |
Non Management Directors [Member] | 2007 Long-Term Incentive Plan [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Grants in period (shares) |  |  |  | 300,000 | 0 | 200,000 |
Exercise price of stock options granted (in dollars per share) | $ / shares |  |  |  | $ 3.74 |  | $ 4.10 |
Term of stock options |  |  |  | 10 years |  |  |
Officer [Member] | 2007 Long-Term Incentive Plan [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Grants in period (shares) |  |  |  | 200,000 | 58,000 | 100,000 |
Exercise price of stock options granted (in dollars per share) | $ / shares |  |  |  | $ 3.74 | $ 5.39 | $ 4.25 |
Term of stock options |  |  |  | 10 years |  |  |
Vesting period |  |  |  | 3 years |  |  |
Officer [Member] | 2007 Long-Term Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] | Subsidiaries Employees [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |  |
Restricted stock units aggregate value, granted (in shares) | $ |  |  |  | $ 1,000,000 | $ 1,000,000 | $ 2,300,000 |
2007 Long-Term Incentive Plan [Member] | Officer [Member] | Restricted Stock Units (RSUs) [Member] | Subsidiaries Employees [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, granted (in shares) |  |  |  | 300,000 | 200,000 | 600,000 |
Maximum [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividend range under dividend policy | 50.00% |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividend range under dividend policy | 30.00% |  |  |  |  |  |
Dividends per quarter (USD per share) | $ / shares | $ 0.03 |  |  |  | $ 0.03 |  |
Class A [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 200,000,000 |  |  | 200,000,000 | 200,000,000 |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.01 |  |  | $ 0.01 | $ 0.01 |  |
Votes per share owned | vote |  |  |  | 1 |  |  |
Common stock, shares issued (in shares) | 132,800,000 |  |  | 136,100,000 | 132,800,000 |  |
Common stock, shares outstanding (in shares) | 132,800,000 |  |  | 136,100,000 | 132,800,000 |  |
Class A [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 200,000 | 200,000 |  |
Class A [Member] | General and Administrative Expense [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Share-based compensation expense recorded in general and administrative expenses | $ |  |  |  | $ 35,000 | $ 300,000 | $ 100,000 |
Class A [Member] | Non Management Directors [Member] | 2007 Long-Term Incentive Plan [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  | 9,358 | 51,948 | 17,073 |
Class A [Member] | 2007 Long-Term Incentive Plan [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares reserved for issuance upon awards to be granted (in shares) | 4,000,000 |  |  | 4,000,000 | 4,000,000 |  |
Class B [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | 100,000,000 |  |  | 100,000,000 | 100,000,000 |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 0.01 |  |  |
Votes per share owned | vote |  |  |  | 5 |  |  |
Maximum percentage of voting power |  |  |  | 49.00% |  |  |
Common stock, shares issued (in shares) | 23,200,000 |  |  | 23,200,000 | 23,200,000 |  |
Common stock, shares outstanding (in shares) | 23,200,000 |  |  | 23,200,000 | 23,200,000 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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=96867065&loc=d3e5070-113901 + Details
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