Derivatives (Fair Value of Derivative Instruments) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Fair value	[1]	$ 1.7	$ 2.4
Interest Rate Swap One [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		25.0
Derivative, Fair value	[1]	$ 0.1	0.2
Derivative, Interest Rate		1.10%
Derivative, Maturity Date		Jul. 31, 2016
Interest Rate Swap Two [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 28.1
Derivative, Fair value	[1]	$ 0.2	0.4
Derivative, Interest Rate		1.38%
Derivative, Maturity Date		Jan. 02, 2017
Interest Rate Swap Three [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 33.0
Derivative, Fair value	[1]	$ 0.0	(0.1)
Derivative, Interest Rate		3.72%
Derivative, Maturity Date		Dec. 01, 2017
Interest Rate Swap Four [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 7.6
Derivative, Fair value	[1]	$ 0.0	0.0
Derivative, Interest Rate		1.00%
Derivative, Maturity Date		Jan. 01, 2018
Interest Rate Swap Five [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 55.0
Derivative, Fair value	[1]	$ 0.1	0.0
Derivative, Interest Rate		1.12%
Derivative, Maturity Date		Jan. 01, 2018
Interest Rate Swap Six [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 48.0
Derivative, Fair value	[1]	$ 0.1	0.0
Derivative, Interest Rate		1.12%
Derivative, Maturity Date		Jan. 01, 2018
Interest Rate Swap Seven [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 30.0
Derivative, Fair value	[1]	$ 0.5	0.4
Derivative, Interest Rate		1.78%
Derivative, Maturity Date		Jan. 02, 2019
Interest Rate Swap Eight [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 20.0
Derivative, Fair value	[1]	$ 0.4	0.3
Derivative, Interest Rate		1.78%
Derivative, Maturity Date		Jan. 02, 2019
Interest Rate Swap Nine [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 20.0
Derivative, Fair value	[1]	$ 0.3	0.3
Derivative, Interest Rate		1.78%
Derivative, Maturity Date		Jan. 02, 2019
Interest Rate Swap Ten [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 20.0
Derivative, Fair value	[1]	$ 0.3	0.3
Derivative, Interest Rate		1.79%
Derivative, Maturity Date		Jan. 02, 2019
Interest Rate Swap Eleven [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 20.0
Derivative, Fair value	[1]	$ 0.3	0.3
Derivative, Interest Rate		1.79%
Derivative, Maturity Date		Jan. 02, 2019
Interest Rate Swap Twelve [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 20.0
Derivative, Fair value	[1]	$ 0.3	$ 0.3
Derivative, Interest Rate		1.79%
Derivative, Maturity Date		Jan. 02, 2019
Interest Rate Swap Thirteen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 25.0
Derivative, Fair value	[1]	$ 0.0
Derivative, Interest Rate		1.16%
Derivative, Maturity Date		Jan. 02, 2019
Interest Rate Swap Fourteen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 25.0
Derivative, Fair value	[1]	$ 0.0
Derivative, Interest Rate		1.16%
Derivative, Maturity Date		Jan. 02, 2019
Interest Rate Swap Fifteen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 25.0
Derivative, Fair value	[1]	$ 0.0
Derivative, Interest Rate		1.16%
Derivative, Maturity Date		Jan. 02, 2019
Interest Rate Swap Sixteen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 20.0
Derivative, Fair value	[1]	$ 0.0
Derivative, Interest Rate		1.16%
Derivative, Maturity Date		Jan. 02, 2019
Interest Rate Swap Seventeen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 20.0
Derivative, Fair value	[1]	$ (0.1)
Derivative, Interest Rate		1.233%
Derivative, Maturity Date		Jun. 26, 2020
Interest Rate Swap Eighteen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 20.0
Derivative, Fair value	[1]	$ (0.2)
Derivative, Interest Rate		1.233%
Derivative, Maturity Date		Jun. 26, 2020
Interest Rate Swap Nineteen [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 20.0
Derivative, Fair value	[1]	$ 0.2
Derivative, Interest Rate		1.233%
Derivative, Maturity Date		Jun. 26, 2020
Interest Rate Swap Twenty [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 20.0
Derivative, Fair value	[1]	$ (0.2)
Derivative, Interest Rate		1.233%
Derivative, Maturity Date		Jun. 26, 2020
Interest Rate Swap Twenty One [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount		$ 20.0
Derivative, Fair value	[1]	$ (0.2)
Derivative, Interest Rate		1.24%
Derivative, Maturity Date		Jun. 26, 2020

[1] As of December 31, 2015 and December 31, 2014, derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy and we do not have any significant recurring fair value measurements related to derivative instruments using significant unobservable inputs (Level 3).