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Employee Benefit Plans - Share-based Compensation Stock Options Outstanding and Options Exercisable (Detail) (USD $)
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12 Months Ended |
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Dec. 31, 2013
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
| Options outstanding numbers of shares |
933,450 |
| Options outstanding Weighted - Average Remaining Contractual Life (in years) |
5 years 7 months 6 days |
| Options exercise number of shares |
763,540 |
| Options exercisable weighted-average remaining contractual life (in years) |
5 years 2 months 16 days |
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Exercise Price Range One [Member]
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding numbers of shares |
301,650 |
| Options outstanding Weighted - Average Remaining Contractual Life (in years) |
5 years 8 months 12 days |
| Options outstanding weighted average exercise price |
$ 8.90 |
| Options exercise number of shares |
240,300 |
| Options exercisable weighted-average remaining contractual life (in years) |
5 years 8 months 12 days |
| Options exercisable weighted average exercise price |
$ 8.90 |
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Exercise Price Range One [Member] | Minimum [Member]
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 8.50 |
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Exercise Price Range One [Member] | Maximum [Member]
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|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 9.00 |
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Exercise Price Range Two [Member]
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|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding numbers of shares |
509,000 |
| Options outstanding Weighted - Average Remaining Contractual Life (in years) |
4 years 10 months 13 days |
| Options outstanding weighted average exercise price |
$ 9.49 |
| Options exercise number of shares |
496,000 |
| Options exercisable weighted-average remaining contractual life (in years) |
4 years 10 months 2 days |
| Options exercisable weighted average exercise price |
$ 9.49 |
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Exercise Price Range Two [Member] | Minimum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 9.00 |
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Exercise Price Range Two [Member] | Maximum [Member]
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|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
| Options outstanding weighted average exercise price |
$ 9.50 |
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Exercise Prices Range Three [Member]
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|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding numbers of shares |
2,500 |
| Options outstanding Weighted - Average Remaining Contractual Life (in years) |
6 years 6 months 26 days |
| Options outstanding weighted average exercise price |
$ 10.75 |
| Options exercise number of shares |
1,500 |
| Options exercisable weighted-average remaining contractual life (in years) |
6 years 6 months 26 days |
| Options exercisable weighted average exercise price |
$ 10.75 |
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Exercise Prices Range Three [Member] | Minimum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 10.50 |
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Exercise Prices Range Three [Member] | Maximum [Member]
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|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 11.00 |
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Exercise Prices Range Four [Member]
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|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding numbers of shares |
5,000 |
| Options outstanding Weighted - Average Remaining Contractual Life (in years) |
6 years 5 months 23 days |
| Options outstanding weighted average exercise price |
$ 11.13 |
| Options exercise number of shares |
3,000 |
| Options exercisable weighted-average remaining contractual life (in years) |
6 years 5 months 23 days |
| Options exercisable weighted average exercise price |
$ 11.13 |
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Exercise Prices Range Four [Member] | Minimum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 11.00 |
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Exercise Prices Range Four [Member] | Maximum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 11.50 |
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Exercise Prices Range Five [Member]
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|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding numbers of shares |
20,600 |
| Options outstanding Weighted - Average Remaining Contractual Life (in years) |
7 years 10 months 24 days |
| Options outstanding weighted average exercise price |
$ 12.23 |
| Options exercise number of shares |
8,240 |
| Options exercisable weighted-average remaining contractual life (in years) |
7 years 10 months 24 days |
| Options exercisable weighted average exercise price |
$ 12.23 |
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Exercise Prices Range Five [Member] | Minimum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
| Options outstanding weighted average exercise price |
$ 12.00 |
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Exercise Prices Range Five [Member] | Maximum [Member]
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|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 12.50 |
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Exercise Prices Range Six [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding numbers of shares |
25,000 |
| Options outstanding Weighted - Average Remaining Contractual Life (in years) |
7 years 10 months 10 days |
| Options outstanding weighted average exercise price |
$ 13.29 |
| Options exercise number of shares |
7,500 |
| Options exercisable weighted-average remaining contractual life (in years) |
7 years 8 months 12 days |
| Options exercisable weighted average exercise price |
$ 13.32 |
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Exercise Prices Range Six [Member] | Minimum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 13.00 |
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Exercise Prices Range Six [Member] | Maximum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 13.50 |
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Exercise Prices Range Seven [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding numbers of shares |
15,000 |
| Options outstanding Weighted - Average Remaining Contractual Life (in years) |
7 years 6 months 7 days |
| Options outstanding weighted average exercise price |
$ 13.73 |
| Options exercise number of shares |
6,000 |
| Options exercisable weighted-average remaining contractual life (in years) |
7 years 6 months 7 days |
| Options exercisable weighted average exercise price |
$ 13.73 |
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Exercise Prices Range Seven [Member] | Minimum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 13.50 |
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Exercise Prices Range Seven [Member] | Maximum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 14.00 |
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Exercise Prices Range Eight [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding numbers of shares |
5,000 |
| Options outstanding Weighted - Average Remaining Contractual Life (in years) |
8 years 11 months 12 days |
| Options outstanding weighted average exercise price |
$ 16.30 |
| Options exercise number of shares |
1,000 |
| Options exercisable weighted-average remaining contractual life (in years) |
8 years 11 months 12 days |
| Options exercisable weighted average exercise price |
$ 16.30 |
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Exercise Prices Range Eight [Member] | Minimum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 16.00 |
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Exercise Prices Range Eight [Member] | Maximum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 16.50 |
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Exercise Price Range Nine [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding numbers of shares |
46,700 |
| Options outstanding Weighted - Average Remaining Contractual Life (in years) |
9 years 3 months 26 days |
| Options outstanding weighted average exercise price |
$ 18.28 |
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Exercise Price Range Nine [Member] | Minimum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 18.00 |
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Exercise Price Range Nine [Member] | Maximum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 18.50 |
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Exercise Price Range Ten [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding numbers of shares |
3,000 |
| Options outstanding Weighted - Average Remaining Contractual Life (in years) |
9 years 9 months 22 days |
| Options outstanding weighted average exercise price |
$ 22.24 |
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Exercise Price Range Ten [Member] | Minimum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 22.00 |
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Exercise Price Range Ten [Member] | Maximum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Options outstanding weighted average exercise price |
$ 22.50 |