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Employee Benefit Plans - Additional Information (Detail) (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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Dec. 31, 2011
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Percentage of partnership contribution in professionals pre-tax annual compensation | 2.00% | ||
| Annual maximum contribution professionals are able to receive from Plan Partnerships | $ 1,600 | ||
| Additional percentage of partnership contribution in professionals pre-tax annual compensation | 50.00% | ||
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401(k) Plan
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Expenses incurred by partnership in connection with employee benefit plan | 1,700,000 | 1,500,000 | 1,400,000 |
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Defined Contribution Pension
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Expenses incurred by partnership in connection with employee benefit plan | $ 400,000 | $ 400,000 | $ 300,000 |