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Fair Value of Financial Instruments - Schedule of Quantitative Information Associated with Fair Value Measurement of Our Recurring Level 3 Inputs (Detail) (Fair Value, Measurements, Recurring [Member], Income Approach [Member], USD $)
In Millions, unless otherwise specified |
12 Months Ended |
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Dec. 31, 2013
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| Fair Value Inputs, Assets, Quantitative Information [Line Items] | |
| Level 3 Assets Contingent Consideration | $ 0.3 |
| Significant Unobservable Input | Probabilities of retention of management contracts (a) |
| Weighted Average | 98.00% |
| Minimum [Member] | |
| Fair Value Inputs, Assets, Quantitative Information [Line Items] | |
| Range of Inputs | 75.00% |
| Maximum [Member] | |
| Fair Value Inputs, Assets, Quantitative Information [Line Items] | |
| Range of Inputs | 100.00% |