Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Estimated Useful Life of Property Plant and Equipment (Detail)

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Summary of Significant Accounting Policies - Estimated Useful Life of Property Plant and Equipment (Detail)
12 Months Ended
Dec. 31, 2013
Office Equipment | Minimum
 
Property Plant And Equipment [Line Items]  
Estimated useful life 3 years
Office Equipment | Maximum
 
Property Plant And Equipment [Line Items]  
Estimated useful life 5 years
Leasehold Improvements | Minimum
 
Property Plant And Equipment [Line Items]  
Estimated useful life 8 years
Leasehold Improvements | Maximum
 
Property Plant And Equipment [Line Items]  
Estimated useful life 12 years