Related Party Transactions - Transactions with Related Parties (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Transactions with Third Party [Line Items]
Revenues generated from investee accounted for under equity method	$ 0.5	$ 0.6	$ 1.6	$ 2.0
Popular [Member]
Transactions with Third Party [Line Items]
Total revenues from Popular	45.00%	46.00%	45.00%	45.00%

Reflects the sum of all other revenue and income realized from sales and other transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party during the period.

No definition available.

Name:	us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration