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Stock-Based Compensation - Summary of Share Option Activity of Stock Option and Stock Appreciation Rights Under 2001 Plan (Detail) (2001 Plan [Member], USD $)
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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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Stock Option [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock based compensation, Shares Outstanding, beginning balance |
80,800 |
205,800 |
| Stock based compensation, Shares, Granted |
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| Stock based compensation, Shares, Exercised |
(11,600) |
(5,600) |
| Stock based compensation, Shares, Forfeited/Expired |
(15,400) |
(119,400) |
| Stock based compensation, Shares Outstanding, ending balance |
53,800 |
80,800 |
| Stock based compensation, Shares, Exercisable |
53,800 |
78,160 |
| Stock based compensation, Weighted Average Fair Value Per Share, beginning balance |
$ 52.43 |
$ 53.12 |
| Stock based compensation, Weighted Average Fair Value Per Share, Granted |
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| Stock based compensation, Weighted Average Fair Value Per Share, Exercised |
$ 30.39 |
$ 20.12 |
| Stock based compensation, Weighted Average Fair Value Per Share, Forfeited/Expired |
$ 63.58 |
$ 55.13 |
| Stock based compensation, Weighted Average Fair Value Per Share, ending balance |
$ 53.99 |
$ 52.43 |
| Stock based compensation, Weighted Average Fair Value Per Share, Exercisable |
$ 53.99 |
$ 56.81 |
| Stock based compensation, Weighted Average Remaining Contractual Term, Outstanding |
3 years 9 months 18 days |
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| Stock based compensation, Weighted Average Remaining Contractual Term, Exercisable |
3 years 9 months 18 days |
3 years 11 months 23 days |
| Stock based compensation, Aggregate Intrinsic Value, Outstanding |
$ 46,950 |
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| Stock based compensation, Aggregate Intrinsic Value, Exercisable |
46,950 |
21,780 |
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Stock Appreciation Rights [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock based compensation, Shares Outstanding, beginning balance |
80,800 |
205,800 |
| Stock based compensation, Shares, Granted |
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| Stock based compensation, Shares, Exercised |
(11,600) |
(5,600) |
| Stock based compensation, Shares, Forfeited/Expired |
(15,400) |
(119,400) |
| Stock based compensation, Shares Outstanding, ending balance |
53,800 |
80,800 |
| Stock based compensation, Shares, Exercisable |
53,800 |
78,160 |
| Stock based compensation, Weighted Average Fair Value Per Share, beginning balance |
$ 1.12 |
$ 0.93 |
| Stock based compensation, Weighted Average Fair Value Per Share, Granted |
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| Stock based compensation, Weighted Average Fair Value Per Share, Exercised |
$ 4.29 |
$ 5.07 |
| Stock based compensation, Weighted Average Fair Value Per Share, Forfeited/Expired |
$ 0.46 |
$ 0.73 |
| Stock based compensation, Weighted Average Fair Value Per Share, ending balance |
$ 1.61 |
$ 1.12 |
| Stock based compensation, Weighted Average Fair Value Per Share, Exercisable |
$ 1.61 |
$ 0.92 |
| Stock based compensation, Weighted Average Remaining Contractual Term, Outstanding |
3 years 9 months 18 days |
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| Stock based compensation, Weighted Average Remaining Contractual Term, Exercisable |
3 years 9 months 18 days |
3 years 11 months 23 days |
| Stock based compensation, Aggregate Intrinsic Value, Outstanding |
25,281 |
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| Stock based compensation, Aggregate Intrinsic Value, Exercisable |
$ 25,281 |
$ 11,728 |