Description of Business and Summary of Significant Accounting Policies - Other Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Other Liabilities [Abstract]
Pension and postretirement benefits liability	$ 41,783	$ 25,760
Straight-line lease liability	79,352	73,871
Deferred compensation liability	19,712	18,883
Other	1,172	1,418
Total other liabilities	$ 142,019	$ 119,932