Accumulated Other Comprehensive Loss - Changes in AOCL by Component (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ (69,418)	$ (82,164)
Other comprehensive income (loss) before reclassifications	4,235	(35,356)
Amounts reclassified from AOCL	2,008	13,624
Other comprehensive income (loss), net	6,243	(21,732)	$ 33,285
Spin-off of Paragon Offshore		34,478
Ending balance	(63,175)	(69,418)	(82,164)
Gains / (Losses) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	0	0
Other comprehensive income (loss) before reclassifications	2,414	(4,286)
Amounts reclassified from AOCL	(2,414)	4,286
Other comprehensive income (loss), net	0	0
Spin-off of Paragon Offshore		0
Ending balance	0	0	0
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(58,440)	(58,598)
Other comprehensive income (loss) before reclassifications	7,099	(30,952)
Amounts reclassified from AOCL	4,422	9,338
Other comprehensive income (loss), net	11,521	(21,614)
Spin-off of Paragon Offshore		21,772
Ending balance	(46,919)	(58,440)	(58,598)
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(10,978)	(23,566)
Other comprehensive income (loss) before reclassifications	(5,278)	(118)
Amounts reclassified from AOCL	0	0
Other comprehensive income (loss), net	(5,278)	(118)
Spin-off of Paragon Offshore		12,706
Ending balance	$ (16,256)	$ (10,978)	$ (23,566)