Shareholders' Equity - Additional Information (Detail)	Dec. 31, 2014	Dec. 31, 2013	May 14, 2008
Stockholders' Equity Note [Abstract]
Repurchases of common stock authorized	0	0	2,000,000
Common stock remaining authorized for repurchase	2,000,000

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant