Quarterly Results of Operations (Unaudited) - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014 Acquisition	Mar. 31, 2013	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Merger and acquisition related costs before tax	$ 1,473	$ 8,407		$ 9,248
Merger and acquisition related costs after tax	3,199	7,319
Number Of business acquisitions closed		4
Debt issuance Cost Write Off Before Tax		2,974
Debt issuance Cost Write Off After Tax		1,903
Foreign exchange gains or losses on intercompany loans after tax			350
Restructuring and non-operating charges			$ 399