Income Tax Provision (Benefit) for Federal, and State and Local Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Current income tax expense, Federal									$ (1,152)	$ 7,140	$ 6,927
Current income tax expense, State and local									986	702	3,765
Current income tax expense, Foreign									8,358	9,557	5,256
Total current									8,192	17,399	15,948
Deferred:
Deferred income tax expense, Federal									(93,376)	(94,058)	(117,623)
Deferred income tax expense, State and local									(93)	594	(526)
Deferred income tax expense, Foreign									(10,700)	(2,060)	(1,700)
Total deferred									(104,169)	(95,524)	(119,849)
Total benefit	$ (66,757)	$ (29,606)	$ (5,501)	$ 5,887	$ (103,282)	$ 9,433	$ 6,888	$ 8,836	$ (95,977)	$ (78,125)	$ (103,901)