Significant Accounting Policies - Schedule of Earnings Per Share (Detail) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Weighted average basic common shares outstanding-basic	40,327	40,636	40,501	40,583
Dilutive effect of common stock options and awards	235	185	222	184
Weighted average diluted common shares outstanding-diluted	40,562	40,821	40,723	40,767