Income Taxes - Reconciliation of Statutory Rate to Effective Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Computed tax at statutory rate (percent)	35.00%	35.00%	35.00%
Adjustment for income in non-taxable entities allocable to noncontrolling interest (percent)	(13.00%)	(7.60%)	16.50%
Tax rate differential on pre-tax book income, other (percent)	(6.60%)	5.60%	2.10%
Local tax on branch profits/(losses)—Puerto Rico (percent)	0.30%	1.60%	13.10%
Permanent book/tax differences (domestic only) (percent)	(0.10%)	(0.10%)	(2.20%)
Valuation allowance (percent)	(25.10%)	(33.40%)	187.20%
Chilean shareholder benefit due to tax regime change (percent)	0.40%	(3.60%)	0.00%
Change in tax rate due to change in Chilean tax regime (percent) (percent)	0.00%	(6.20%)	0.00%
Other (percent)	(0.70%)	0.10%	3.10%
ARRA Section 1603 grant-basis reduction deferred tax assets (percent)	(0.00%)	(0.00%)	(223.70%)
Effective income tax rate (percent)	(9.80%)	(8.60%)	31.10%