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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 0 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012
Income Taxes [Line Items] |  |  |
Taxes Payable | $ 20,304 | $ 4,713 | $ 20,304
LP Units exchanged by employees (in shares) | 983 | 2,913 | 2,108
LP Units Exchanged by Employees Which Triggered Additional Liability Under Tax Receivable Agreement |  | 1,377 |
Payment to the LP Unit holders of the cash tax savings (as a percent) |  | 85.00% |
Retained percent of tax benefits (as a percent) |  | 15.00% |
Deferred Tax Assets - Non-Current | 229,449 | 251,613 | 229,449
Amounts Due Pursuant to Tax Receivable Agreements | 165,350 | 175,771 | 165,350
Increase to Additional Paid-In-Capital |  | 20,222 | 15,022
Increase (decrease) in deferred tax assets, changes in compensation benefits |  | 5,777 |
Increase (decrease) in deferred tax assets, changes in depreciation and amortization |  | 5,931 |
Increase (decrease) in deferred tax assets, changes in unrealized gain (loss) on marketable securities |  | 182 | (111)
Increase (decrease) in deferred tax assets, changes in foreign currency translation adjustments |  | 307 | 1,870
Unrecognized tax benefits that would affect the effective tax rate |  | 474 |
Income tax penalties and interest expense |  | 166 | 16
Income tax penalties and interest accrued | 49 | 215 | 49
Tax benefits associated with the lapse of statute of limitations |  |  | (603)
U.K. [Member] |  |  |
Income Taxes [Line Items] |  |  |
Net operating loss and tax credit carryforwards |  | 2,398 |
Exchange of LP Units [Member] |  |  |
Income Taxes [Line Items] |  |  |
LP Units exchanged by employees (in shares) |  | 1,930 |
Deferred Tax Assets - Non-Current |  | 31,534 |
Amounts Due Pursuant to Tax Receivable Agreements |  | 26,804 |
Increase to Additional Paid-In-Capital |  | 4,730 |
Foreign Subsidiaries [Member] |  |  |
Income Taxes [Line Items] |  |  |
Undistributed earnings of foreign subsidiaries |  | 4,476 |
Unrecognized net deferred tax liability |  | $ 1,288 |

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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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