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Employee Benefits - Additional Information (Detail) (USD $)
 12 Months Ended
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%