Income Taxes - Income Tax Expense (Benefit) (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	[1]	Sep. 30, 2016	[1]	Jun. 30, 2016	[1]	Mar. 31, 2016	[1]	Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Federal
Current													$ 2,586	$ 14,108		$ (6,889)
Deferred													19,212	19,034		18,024
Total													21,798	33,142		11,135
State
Current													(1,857)	12,565		379
Deferred													(1,324)	(2,502)		(4,096)
Total													(3,181)	10,063		(3,717)
Foreign
Current													16,048	11,671		15,117
Deferred													3,772	1,170		5,402
Total													19,820	12,841		20,519
Income tax provision	$ 65,758	$ (2,233)	$ (20,914)	$ (4,174)	$ 43,171		$ (6,426)		$ (17,669)		$ 36,970		$ 38,437	$ 56,046	[1]	$ 27,937

[1] The Company adopted ASU 2016-09, Compensation - Stock Compensation: Improvements to Employee Share-Based Payment Accounting, ("ASU 2016-09") during the year ended December 31, 2016. The Company elected to early adopt ASU 2016-09 in the third quarter of 2016, which requires it to reflect any adjustments as of January 1, 2016, the beginning of the annual period that includes the interim period of adoption. The impact of the adoption to the Company's previously reported quarterly results for the quarters ended March 31 and June 30, 2016 are reflected in the table above.