Operating Segments - Narrative (Detail) $ in Millions |
Jun. 30, 2015
USD ($)
nonconsolidated_partner_company
|
Dec. 31, 2014
USD ($)
|
---|---|---|
Segment Reporting Information [Line Items] | ||
Non-consolidated partner companies | 28 | |
Other Items [Member] | ||
Segment Reporting Information [Line Items] | ||
Total assets included cash, cash equivalents, cash held in escrow, and marketable securities | $ | $ 105.5 | $ 156.5 |