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Stock-Based Compensation Plans - Components of Stock-Based Compensation Included in Consolidated Statements of Net and Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2014
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Mar. 31, 2013
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Share-based compensation expense - Independent contractors | $ 487 | |
| Allocated share-based compensation expense | 717 | 436 |
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Restricted stock and SARs (prior to IPO) [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Allocated share-based compensation expense | 436 | |
|
Restricted Stock [Member] | Non-employee directors [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Allocated share-based compensation expense | 30 | |
|
Restricted Stock Units (RSUs) [Member] | Employees [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Allocated share-based compensation expense | $ 200 | |