Derivative Financial Instruments and Hedging Activities - Summary of Interest Rate Swap Components (Detail)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Weighted average pay rate	7.22%	7.28%
Weighted average receive rate	1.73%	1.98%
Weighted average maturity in years	2 years 11 months 1 day	1 year 6 months 11 days

Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_DerivativeAverageRemainingMaturity1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration