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Employee Benefit Plans - Additional Information (Detail)
 12 Months Ended 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2012
GBP (£)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2012
Level 3 [Member]
USD ($)
Dec. 31, 2011
Level 3 [Member]
USD ($)
Dec. 31, 2012
Level 1 [Member]
Funds [Member]
Dec. 31, 2011
Level 1 [Member]
Funds [Member]
Dec. 31, 2012
Asset Management [Member]
Level 1 [Member]
Equity funds [Member]
USD ($)
Dec. 31, 2011
Asset Management [Member]
Level 1 [Member]
Equity funds [Member]
USD ($)
Dec. 31, 2011
U K Pension Plan [Member]
USD ($)
Dec. 31, 2011
U K Pension Plan [Member]
GBP (£)
Dec. 31, 2012
Payments from 2014 through 2020 [Member]
GBP (£)
Dec. 31, 2012
Payments from 2012 through 2020 [Member]
GBP (£)
Dec. 31, 2012
U.S. Pension Plans [Member]
USD ($)
Dec. 31, 2012
Non-U.S. Pension Plans [Member]
Level 1 [Member]
Equity funds [Member]
Dec. 31, 2011
Non-U.S. Pension Plans [Member]
Level 1 [Member]
Equity funds [Member]
Dec. 31, 2012
Non-U.S. Pension Plans [Member]
Level 2 [Member]
Debt funds [Member]
Dec. 31, 2011
Non-U.S. Pension Plans [Member]
Level 2 [Member]
Debt funds [Member]
Dec. 31, 2012
Non-U.S. Pension Plans [Member]
Level 2 [Member]
Alternative investments [Member]
Dec. 31, 2011
Non-U.S. Pension Plans [Member]
Level 2 [Member]
Alternative investments [Member]
Defined Benefit Plan Disclosure [Line Items]                                          
Contribution related to the pension plan                     $ 3,687,000 £ 2,300,000     $ 1,095,000            
Additional contribution to plan assets or escrow account                         1,000,000 1,000,000              
Amended amount from previous escrow arrangement   10,200,000                                      
Aggregate amount in account security arrangement 16,500,000   15,800,000                                    
Company contribution to U.K. pension plans   1,700,000                                      
Other non-U.S pension plans 4,500,000                                        
Change in the assumed healthcare cost trend rate 1.00% 1.00%                                      
Change in plan assets due to purchases         131,000 1,837,000                              
Change in fair value of plan assets due to net unrealized/realized gains and losses         443,000 3,000                              
Net unrealized gains partially offset by favorable (unfavorable) foreign currency translation adjustments         77,000 (63,000)                              
Equity funds managed by LAM                 106,873,000 95,658,000                      
Percentage of plans' assets in equity securities             51.00% 46.00%                          
Percentage of plans' assets in debt securities             49.00% 54.00%                          
Percentage of plan assets invested in equities, debt, funds and cash                               30.00% 27.00% 61.00% 65.00% 9.00% 8.00%
Employer sponsored defined contribution plans $ 13,070,000   $ 10,944,000 $ 9,684,000