Accumulated Other Comprehensive Earnings - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Expense related to pension liability reclassified from accumulated other comprehensive earnings	$ 6,200,000	$ 14,300,000	$ 7,900,000
Expense related to fair value of derivative investments reclassified from accumulated other comprehensive earnings	0	600,000	900,000
Foreign currency translation reclassified from accumulated other comprehensive earnings	$ 0	$ 0	$ 0