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Stock Option Plans and Restricted Stock Awards - Additional Information (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Common Stock [Member] | Dec. 31, 2013 Stock Options [Member] | May 31, 2008 2008 Equity Incentive Plan [Member] | Dec. 31, 2013 2008 Equity Incentive Plan [Member] | Dec. 31, 2012 2008 Equity Incentive Plan [Member] | Dec. 31, 2011 2008 Equity Incentive Plan [Member] | Dec. 31, 2013 2008 Stock Option Plan [Member] | Dec. 31, 2013 Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Authorized issuance of shares of Company common stock |  |  |  |  |  | 3,949,891 |  |  |  |  |
Expiry of equity incentive plan |  |  |  |  |  |  | Dec. 31, 2018 |  |  |  |
Stock option plan, options outstanding | 2,106,000 | 2,604,000 |  |  |  |  |  |  |  | 721,406 |
Total expenses on stock option | $ 850,000.0 | $ 1,100,000 | $ 1,100,000 |  |  |  |  |  |  |  |
Stock options granted under Black-Scholes options pricing model | 45,000 | 248,000 | 31,000 |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 5 years |  |  | 5 years |  |  |
Forfeiture rate | 6.00% |  |  |  |  |  |  |  |  |  |
Intrinsic value of options exercised | 1,400,000 | 618,000.0 | 20,000.0 |  |  |  |  |  |  |  |
Unrecognized compensation cost related to nonvested options granted | 1,100,000 |  |  |  |  |  |  |  |  |  | 2,500,000
Weighted-average period for expected cost recognized | 2 years 6 months 15 days |  |  |  |  |  |  |  |  |  |
Fair value of options vested | 918,000.0 | 1,100,000 | 1,500,000 |  |  |  |  |  |  |  |
Cash received from stock option exercises | 4,500,000 | 2,600,000 | 59,000 |  |  |  |  |  |  |  |
Common stock, shares outstanding | 105,370,170 | 104,889,586 |  |  | 2,105,843 |  |  |  |  |  |
Number of common shares, options exercisable | 1,635,000 |  |  | 1,635,043 |  |  |  |  |  |  |
Options exercisable lower price range | $ 7.68 |  |  |  |  |  |  |  |  |  |
Options exercisable upper price range | $ 15.53 |  |  |  |  |  |  |  |  |  |
2008 Equity Incentive Plan, granted restricted stock awards |  |  |  |  |  |  | 100,000 | 173,000 | 0 |  |
Weighted average fair value of restricted stock |  |  |  |  |  |  | $ 13.25 | $ 11.10 |  |  | $ 13.25
Period of compensation cost recognized | 5 years |  |  |  |  |  |  |  |  |  |
Amount of compensation cost recognized | $ 1,100,000 | $ 911,000 | $ 1,100,000 |  |  |  |  |  |  |  |
Common stock available for the granting of future options and restricted stock | 1,526,828 |  |  |  |  |  |  |  |  |  |

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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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 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=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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 Net number of share options (or share units) granted during 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 (c)(1)(iv)(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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