Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
LegalMatter
Dec. 31, 2012
Dec. 31, 2011
Commitment And Contingencies [Line Items]      
Rent expense for operating leases $ 19,900,000 $ 11,800,000 $ 12,100,000
Exposure per occurrence, employees compensation 250,000    
Aggregate self insured exposure per employer's liability 500,000    
Exposure per occurrence 500,000    
Aggregate self insured exposure per occurrence, foreign employees compensation 100,000    
Aggregate self insured exposure per employer's liability, foreign 1,000,000    
Aggregate deductible for protection and indemnity and maritime employers' liability claims 500,000    
Auto liability claims 100,000    
Gross self insurance accruals 5,700,000 4,700,000  
Related insurance recoveries 1,700,000 1,200,000  
Number of lawsuits 15    
Amount accrued 0    
Fine paid by for retention and use of individual agent in Nigeria with respect to customs-related issues $ 11,760,000    
Minimum [Member]
      
Commitment And Contingencies [Line Items]      
Employment agreements terms 1 year    
Maximum [Member]
      
Commitment And Contingencies [Line Items]      
Employment agreements terms 2 years