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Employee Benefits - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount Rate Description | Certain Company employees are eligible to participate in a defined contribution plan (the "Plan"). Participants in the Plan may elect to defer a portion of their pre-tax earnings into a pension plan, which is run by an independent party. The Company matches participant's contributions typically at 6% of the participant's annual compensation. Contributions to this plan are recorded, as an expense in the Consolidated Statement of Operations. Contributions for the years ended December 31, 2011, December 31, 2012 and December 31, 2013 were $16,644,000, $18,187,000 and $20,293,000 respectively. |  |
Contributions | $ 75,000 | $ 101,000 |
Net gain for the defined benefit pension plan | 20,000 |  |
Prior service cost for the defined benefit pension plan |  |  |
Expected long-term rate of return on assets | 6.10% |  |
Long term equity risk-premium | 6.60% |  |
Expected long term rate of return on bonds Description | Expected long term rates of return to the asset distribution at December 31, 2013, gives rise to an expected overall rate of return of scheme assets of approximately 6.1% per annum. |  |
Contribution to Pension fund | 200,000 |  |
Expected benefit cash flow description | The expected cash flows are estimated figures based on the members expected to retire over the next 10 years assuming no early retirements plus an additional amount in respect of recent average withdrawal experience. |  |
Retirement period used as a basis to estimate expected cash flows | 10 years |  |
Legal and General over 15 year Gilts Index |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Risk free interest rate | 3.60% |  |
Long term equity risk-premium | 3.00% |  |
Expected long term rate of return on bonds Description | The long-term expected return on bonds is determined by reference to UK long dated government and corporate bond yields at the balance sheet date. This is represented by the iboxx AA 15 index plus 30 basis points. |  |
Basis points increase to determine log-term expected return on bonds | 0.30% |  |
Iboxx Corporate Bond |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Basis point increase in benefits obligation discount rate | 0.30% |  |
Defined benefit plan bond maturity period | 15 |  |
Defined Benefit Plan Contributions |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions percentage of compensation | 6.00% |  |
Contributions | 20,293,000 | 18,187,000 | 16,644,000
Defined Contribution Pension Plan 401(k) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions percentage of compensation | 6.00% |  |
Contributions | $ 9,816,000 | $ 8,442,000 | $ 7,064,000
Participant's contributions percentage | 50.00% |  |

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- Definition Defined Benefit Plan, Actual Return on Plan Assets Percentage + References No definition available. + Details
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- Definition Defined Benefit Plan High Quality Bond Maturity Maximum Range Used To Determine Yield Curve In Years + References No definition available. + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512013 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Description and explanation of the assumptions (including assumed discount rates, rates of compensation increase, and expected long-term rates of return on plan assets) used to calculate the benefit obligation and the assumptions used to calculate net periodic benefit cost. May also include other assumptions such as market-related value, average remaining service period, and average remaining life expectancy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition A narrative description of the basis used to determine the overall expected long-term rate-of-return on assets assumption, such as the general approach used, the extent to which the overall rate-of-return on assets assumption was based on historical returns, the extent to which adjustments were made to those historical returns to reflect expectations of future returns, and how those adjustments were determined. The description would generally consider the major categories of assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Description of and general information regarding the types of plans utilized by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2410-114920 + Details
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