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Property and Equipment - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Property Plant And Equipment [Line Items]        
Depreciation and amortization $ 1,457,000 $ 1,159,000 $ 4,180,000 $ 3,322,000
Interest cost paid 300,000 300,000 900,000 900,000
Interest costs capitalized 0 0 0 400,000
Computer software development costs capitalized 1,100,000 600,000 2,700,000 1,300,000
Property and Equipment [Member]        
Property Plant And Equipment [Line Items]        
Depreciation and amortization $ 2,000,000 $ 1,400,000 $ 5,600,000 $ 4,000,000