Summary of Notes Payable (Parenthetical) (Detail)	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Average interest rate	2.82%	3.07%

Weighted average interest rate of debt outstanding.

No definition available.

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant