Pension Benefits And Other Postretirement Benefits Recognized In the Accompanying Consolidated Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Other noncurrent assets	$ 23	$ 263
Deferred tax asset	19,618	26,421
Total assets	19,641	26,684
Current liabilities	(5,097)	(4,561)
Long-term liabilities	(211,177)	(226,584)
Deferred tax liability	(644)	(449)
Total liabilities	(216,918)	(231,594)
Accumulated other comprehensive income	48,957	70,377
Net amount recognized	(148,320)	(134,533)
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Other noncurrent assets	0	0
Deferred tax asset	605	1,764
Total assets	605	1,764
Current liabilities	(491)	(654)
Long-term liabilities	(11,445)	(13,564)
Deferred tax liability	0	0
Total liabilities	(11,936)	(14,218)
Accumulated other comprehensive income	961	2,805
Net amount recognized	$ (10,370)	$ (9,649)