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v3.7.0.1

- Capital Stock (Detail) | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 $ / shares | Jun. 30, 2017 USD ($) time $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Dec. 31, 2016 $ / shares shares
Class of Stock [Line Items] |  |  |  |
Preferred stock, share authorized (in shares) |  | 25,000,000 |  | 25,000,000
Preferred stock, par value (in usd per share) | $ / shares |  | $ 1 |  | $ 1
Common stock, share authorized (in shares) |  | 725,000,000 |  | 725,000,000
Common stock, par value (in usd per share) | $ / shares |  | $ 0.001 |  | $ 0.001
Preferred stock, share issued (in shares) |  | 0 |  |
Number of common shares or units issued related to the exercise of share based compensation during the period (in shares) |  | 100,000 |  |
Stock options granted (in shares) |  | 731,405 | 916,015 |
Stock option per share value (in usd per share) | $ / shares |  | $ 10.18 | $ 9.44 |
Restricted stock units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares or units granted equity based compensation awards (in shares) |  | 343,330 | 238,609 |
Fair value of granted stock | $ |  | $ 3,500,000 | $ 2,300,000 |
Vesting period |  | 3 years |  |
Performance shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares or units granted equity based compensation awards (in shares) |  | 0 | 311,691 |
Fair value of granted stock | $ |  | $ 0 | $ 3,600,000 |
Vesting period |  | 3 years |  |
Number of times performance units to vest, minimum | time |  | 0 |  |
Restricted stock awards |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of shares or units granted equity based compensation awards (in shares) |  | 83,739 | 67,000 |
Fair value of granted stock | $ |  | $ 900,000 | $ 600,000 |
Stock option |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock option, term |  | 10 years |  |
Vesting period |  | 3 years |  |
Weighted-average grant-date fair value of options granted (in usd per share) | $ / shares | $ 4.71 |  |  |
Expected volatility used in computing fair value of options granted |  | 62.40% |  |
Expected life used in computing fair value of options granted, years |  | 5 years 6 months |  |
Dividend yield used in computing fair value of options granted |  | 2.50% |  |
Risk-free interest rate used in computing fair value of options granted |  | 2.00% |  |
Estimated forfeiture rate used in computing fair value of options granted |  | 7.40% |  |
Period of historical data used to calculate expected volatility in years |  | 5 years |  |

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- Definition Face amount or stated value per share of common stock. + 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 + 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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