Employer Sponsored Benefit Plan (Additional Information) (Detail) (USD $)	12 Months Ended			0 Months Ended	1 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2014	Jul. 31, 2014	Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive loss	$ 17,228,000	$ 14,830,000
Pension settlement cost	4,914,000	0	0
Accumulated other comprehensive loss, pension	1,595,000	4,028,000	1,832,000
Estimated actuarial net loss to be amortized in 2014	(725,000)	(1,069,000)	(918,000)
Discount rate, Benefit Obligation	4.16%	5.09%
Expected return on plan assets, Benefit Obligation	7.25%	7.25%
Employer contributions	2,100,000	1,700,000	1,600,000
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	5.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Remaining Two Percent	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match, First Three Percent	100.00%
United States Pension Plan of US Entity, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Accrued Benefit Liability	17,600,000	12,700,000
Foreign Operations
Defined Benefit Plan Disclosure [Line Items]
Accrued Benefit Liability	1,400,000	1,200,000
Accumulated other comprehensive loss	400,000	200,000
Domestic Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Increase or decrease in pension liability included in other comprehensive income	2,400,000	6,500,000
Estimated actuarial net loss to be amortized in 2014	(900,000)
Cash	900,000
Pension Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Percentage of Eligible Participants Electing Lump Sum Payment				62.00%
Pension Lump Sum Payment					10,300,000
Pension settlement cost						4,900,000
Accumulated other comprehensive loss, pension						$ 1,900,000