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Share Based Compensation - Additional Information (Detail) (USD $)
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12 Months Ended |
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12 Months Ended |
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12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Jan. 14, 2014
Common Class A
Subsequent Event
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Dec. 31, 2013
Share Based Compensation Cost
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Dec. 31, 2012
Share Based Compensation Cost
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Dec. 31, 2011
Share Based Compensation Cost
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Dec. 31, 2012
Maximum
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Dec. 31, 2012
Long Term Incentive Plan Twenty Zero Eight
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Dec. 31, 2013
Long Term Incentive Plan Twenty Zero Eight
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Non-shareholder approved options granted |
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300,000 |
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| Share based compensation, number of shares authorized to be granted |
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3,000,000 |
| Incentive Plan, term |
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10 years |
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| Share based compensation, options granted typical expiration period |
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7 years |
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| Share based compensation, number of shares authorized to be granted as percentage of outstanding Class A common shares |
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15.00% |
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10.00% |
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| Estimated forfeiture rate |
40.00% |
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| Share based compensation, weighted-average grant-date fair value of options granted |
$ 1.13 |
$ 0.76 |
$ 1.67 |
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| Share based compensation, total fair value of shares vested |
$ 305,000 |
$ 432,000 |
$ 448,000 |
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| Share based compensation |
509,000 |
325,000 |
524,000 |
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509,000 |
400,000 |
516,000 |
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| Share based compensation, income tax benefit |
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200,000 |
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| Share based compensation, unrecognized cost related to nonvested |
$ 787,230 |
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| Share based compensation, unrecognized cost related to nonvested, recognition period |
3 years 3 months 18 days |
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| Number of options available for grant |
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6,704,231 |
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