Annual report pursuant to Section 13 and 15(d)

Computations of Basic and Diluted Earnings Per Share (Parenthetical) (Detail)

v2.4.1.9
Computations of Basic and Diluted Earnings Per Share (Parenthetical) (Detail)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share Disclosure [Line Items]      
Weighted average shares of participating unvested restricted stock 810us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights 1,198us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights 1,406us-gaap_IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights