Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Operating lease rent expense	$ 46.5	$ 44.7	$ 44.6
Noncancelable commitments for capital expenditure	$ 29.2