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Impairment Charges - Impairment Charges Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value Measurements [Member] - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unconsolidated joint venture investments, Fair Value Measurements   $ 0.0
Long-lived assets held and used, Fair Value Measurements $ 387.7 407.1
Long-lived assets held and used, Total Losses 104.9 279.0
Impairment of joint venture investments   1.9
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-lived assets held and used, Fair Value Measurements 0.0 0.0
Unconsolidated joint venture investments, Fair Value Measurements   0.0
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-lived assets held and used, Fair Value Measurements 0.0 0.0
Unconsolidated joint venture investments, Fair Value Measurements   0.0
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-lived assets held and used, Fair Value Measurements $ 387.7 407.1
Unconsolidated joint venture investments, Fair Value Measurements   $ 0.0