Income Taxes Relating to Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current income taxes:
U.S. Federal									$ 2,018	$ 2,814	$ (40,306)
State and local									(692)	(1,357)	(1,668)
Foreign									6,801	(7,027)	18,810
Total current income taxes									8,127	(5,570)	(23,164)
Deferred income taxes:
U.S. Federal									(35,661)	24,513	(2,495)
State and local									(9,622)	5,766	(2,975)
Foreign									1,865	(1,705)	(4,344)
Total deferred income taxes									(43,418)	28,574	(9,814)
(Benefit from) provision for income taxes	$ (45,503)	$ 1,934	$ 1,615	$ 6,663	$ 28,157	$ 4,480	$ 2,366	$ (11,999)	$ (35,291)	$ 23,004	$ (32,978)