Weighted Average Useful Life for Each Component of Other Intangible Assets (Detail) - Other intangible assets	12 Months Ended
	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Yrs)	7 years 7 months 6 days
Channel relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Yrs)	8 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Yrs)	8 years 2 months 12 days
Trade name
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Yrs)	4 years 10 months 24 days
Database
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Yrs)	5 years
Covenants-Not-to-Compete
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Yrs)	5 years 3 months 18 days
Trade association
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Yrs)	10 years
Favorable lease
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (Yrs)	4 years 10 months 24 days