Annual report pursuant to Section 13 and 15(d)

Contract Costs - Additional Information (Detail)

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Contract Costs - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Contractors [Abstract]      
Pass-through costs as a percentage of revenue 58.50% 48.30% 45.30%
Prepaid subcontractor costs    $ 33,145