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Summary of Significant Accounting Policies - Significant Estimates Used by Management in Determining Fair Values of Company's Reporting Units (Detail)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill Impairment Testing Assumptions [Line Items]      
Years of cash flows before terminal value 5 years 5 years 5 years
Weighting of three approaches:      
Discounted cash flows 70.00% 70.00% 70.00%
Market multiple 15.00% 15.00% 15.00%
Market capitalization 15.00% 15.00% 15.00%
Minimum [Member]      
Goodwill Impairment Testing Assumptions [Line Items]      
Discount rates 12.50% 12.00% 12.00%
EBITDA multiples 5.5 5.0 5.0
Maximum [Member]      
Goodwill Impairment Testing Assumptions [Line Items]      
Discount rates 14.50% 16.00% 14.00%
EBITDA multiples 7.0 6.5 6.0