Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Significant Estimates Used by Management in Determining Fair Values of Company's Reporting Units (Detail)

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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, 2015
Dec. 31, 2014
Dec. 31, 2013
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 12.00% 12.00% 12.00%
EBITDA multiples 5.0 5.0 5.0
Maximum [Member]      
Goodwill Impairment Testing Assumptions [Line Items]      
Discount rates 16.00% 14.00% 14.00%
EBITDA multiples 6.5 6.0 8.0