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Acquisitions - Consideration (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2013
Minimum [Member]
 
Business Combinations [Line Items]  
Discount rates applied to cash flows 6.50%
Residual capitalization rates 5.75%
Maximum [Member]
 
Business Combinations [Line Items]  
Discount rates applied to cash flows 10.50%
Residual capitalization rates 9.75%