Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Income Taxes [Line Items]
Statutory provision	35.00%		35.00%	35.00%	35.00%
Expense recognized for accrued interest and penalties	$ 190		$ 80	$ 470	$ 120
Accrued interest and penalties related to unrecognized tax benefits	1,980			1,980		$ 1,450
Unrecognized tax benefits	76,990			76,990		68,510
Income taxes paid against liabilities for unrecognized tax benefits	43,200			43,200		41,410
Unrecognized tax benefits, tax disputes				1,660
Service tax refunds claims	(4,130)			(4,130)
Income tax expense repatriation of foreign earnings			$ 270,600
Dividends per share			$ 15.00
Dividend distribution related taxes			$ 210,000
Repatriation of foreign earning			$ 1,030,000
Accrued taxes, likely amount	30,900			30,900
Local tax liability gross	400			400		400
Local tax liability net	300			$ 300		$ 300
Minimum Alternate Tax (MAT)
Income Taxes [Line Items]
Reversal of valuation allowance		$ 2,920
Minimum alternate tax credit expiration period				15 years		10 years
Valuation allowance, net tax charge	39,940			$ 39,940
Valuation allowance	2,450			2,450
Federal tax Provision
Income Taxes [Line Items]
Favorable adjustment upon review of tax liabilities	6,260
Unrecognized tax benefits	6,790			6,790
Tax Year 1996-97
Income Taxes [Line Items]
Unrecognized tax benefits	53,580			53,580
Income tax liability recognized	$ 15,410			$ 15,410