Summary of Significant Accounting Policies - Summary of Self-lnsured Liabilities (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Self-insured liabilities at beginning of year	$ 7.6	$ 7.4
Expense	2.5	2.4
Reversal of self-insured liabilities	(0.4)	(1.0)
Cash expenditures	(1.3)	(1.2)
Self-insured liabilities at end of year	$ 8.4	$ 7.6