Selected Segment Financial Data, Revenues and Income (Loss) Before 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
Segment Reporting Information [Line Items]
Revenues	$ 326,395	$ 225,735	$ 240,599	$ 231,462	$ 342,730		$ 216,975		$ 219,930		$ 226,066		$ 1,024,191	$ 1,005,701		$ 1,045,977
Depreciation and amortization expense													102,224	103,454
Stock-based compensation expense													13,683	43,613		18,380
Income (loss) before income taxes	$ 98,922	$ 1,155	$ (50,723)	$ (5,782)	$ 109,862	[1]	$ (16,252)	[1]	$ (34,143)	[1]	$ 126,114	[1]	43,572	185,581	[1]	113,373
United States [Member]
Segment Reporting Information [Line Items]
Revenues													541,235	527,431		628,013
Other [Member]
Segment Reporting Information [Line Items]
Revenues													482,956	478,270		417,964
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenues														15,416		94,603
Depreciation and amortization expense													54,959	59,488
Stock-based compensation expense													$ 9,219	29,843
Scenario Previously Reported
Segment Reporting Information [Line Items]
Revenues														1,005,701		1,045,977
Depreciation and amortization expense														103,454		97,431
Stock-based compensation expense														43,613		18,380
Income (loss) before income taxes														185,581		113,373
Scenario Previously Reported | Operating Segments [Member] | Americas Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization expense														27,951		24,966
Stock-based compensation expense														5,005		1,638
Income (loss) before income taxes														206,689		111,382
Scenario Previously Reported | Operating Segments [Member] | Americas Segment [Member] | United States [Member]
Segment Reporting Information [Line Items]
Revenues														527,431		628,013
Scenario Previously Reported | Operating Segments [Member] | Americas Segment [Member] | Other [Member]
Segment Reporting Information [Line Items]
Revenues														116,718		82,548
Scenario Previously Reported | Operating Segments [Member] | EMEA Segment [Member]
Segment Reporting Information [Line Items]
Revenues														261,160		250,568
Depreciation and amortization expense														3,830		3,670
Stock-based compensation expense														6,476		1,223
Income (loss) before income taxes														176,958		132,518
Scenario Previously Reported | Operating Segments [Member] | Asia/Pacific Segment [Member]
Segment Reporting Information [Line Items]
Revenues														100,392		84,848
Depreciation and amortization expense														1,820		1,751
Stock-based compensation expense														605		36
Income (loss) before income taxes														62,422		41,658
Scenario Previously Reported | Corporate and Other [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization expense														69,853		67,044
Stock-based compensation expense														31,527		15,483
Income (loss) before income taxes														$ (260,488)		$ (172,185)

[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.