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Business Combinations - Additional Information (Detail)
12 Months Ended
Dec. 31, 2015
Business
Business Acquisition [Line Items]  
Number of businesses acquired 0
Minimum [Member]  
Business Acquisition [Line Items]  
Intangible assets, useful life 5 years
Maximum [Member]  
Business Acquisition [Line Items]  
Intangible assets, useful life 10 years