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Income Taxes - Narrative (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Income Taxes - Narrative (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Provision for income taxes		$ (13,597)	$ (52,725)	$ (45,388)
Effective tax rate (percent)		22.30%	34.60%	37.60%
Net benefit for state taxes rate (percent)		(0.40%)	2.90%	2.00%
Provision for state taxes rate (percent)		(1.20%)	8.20%	5.80%
Net benefit (percent)		3.40%	(6.40%)	(1.20%)
Valuation allowance		$ 4,517	$ 10,047
Federal income tax rate (percent)		35.00%	35.00%	35.00%
Undistributed earnings		$ 35,100
Unrecognized tax benefit		47,949	$ 38,425	$ 71,273	$ 1,784
Unrecognized tax benefits, including penalties and interest			44,400		83,000
Net tax benefit from unrecognized tax benefits, if recognized		14,900	12,700		$ 13,500
Decrease related to settlements with tax authorities		32,000	67,204
Unrecognized tax benefits, income tax penalties and interest expense		300	$ 1,300
Foreign Subsidiaries [Member]
Income Taxes [Line Items]
Net operating loss carry forward		63,500
Domestic Subsidiaries [Member]
Income Taxes [Line Items]
Net operating loss carry forward		1,600
Settlement with Taxing Authority [Member]
Income Taxes [Line Items]
Provision for income taxes		6,600
AACC Merger [Member]
Income Taxes [Line Items]
Unrecognized tax benefits, including penalties and interest		$ 58,500
Tax Holiday Through December 31, 2018 [Member] \| Costa Rica [Member]
Income Taxes [Line Items]
Holiday tax rate		100.00%
Subsequent Four Years [Member] \| Costa Rica [Member]
Income Taxes [Line Items]
Holiday tax rate		50.00%
Income tax holiday, term		4 years
Consent Order, Consumer Finance Protection Bureau [Member]
Income Taxes [Line Items]
Litigation settlement penalty	$ 10,000