Employer Sponsored Benefit Plans - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Contributions made by company to domestic pension plan	$ 1,200,000	$ 0
Minimum
Defined Benefit Plan Disclosure [Line Items]
Expected domestic pension plan cash contribution in current year	3,500,000
Maximum
Defined Benefit Plan Disclosure [Line Items]
Expected domestic pension plan cash contribution in current year	$ 4,000,000