Accounts Payable and Accrued Liabilities - Carrying Value of Accounts Payable and Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
Accounts payable	$ 199,897	$ 183,672
Wages, severance and related taxes	50,540	47,998
Employee benefits	17,697	18,550
Accrued rebates	34,317	28,002
Accrued interest	22,479	15,162
Current deferred revenue	31,371	12,220
Other (individual items less than 5% of total current liabilities)	42,765	44,340
Accounts payable and accrued liabilities	$ 399,066	$ 349,944