Financial Instruments and Fair Value Measurements - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) Derivative	Dec. 31, 2015 USD ($) Derivative
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Carrying amount of notes	$ 443.3	$ 437.6
Designated As Hedging Instrument [Member]
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Aggregate notional amount	76.9	78.5
Fair Value, Measurements, Recurring [Member]
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Fair value of swap liability	$ 1.0	$ 2.5
Interest Rate Swap [Member]
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative maturity date	Sep. 01, 2017
Derivative fixed interest rate	2.80%
Interest Rate Swap [Member] | Designated As Hedging Instrument [Member]
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Number of interest rate derivatives held | Derivative	1	1
Level 3 [Member]
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Approximate fair value of notes	$ 445.2	$ 441.5