Goodwill and Other Intangible Assets - Summary of Allocation of Acquisition Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Acquired Finite Lived Intangible Assets [Line Items]
Amortizable intangibles, Gross carrying amount	$ 368,796	$ 97,759
Amortizable intangibles, Accumulated Amortization	73,418	63,037
Goodwill	653,666	124,142	$ 121,011
Customer related intangibles [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Amortizable intangibles, Gross carrying amount	$ 181,671	$ 61,325
Amortizable intangibles, Weighted Average Amortization Period	15 years	15 years
Amortizable intangibles, Accumulated Amortization	$ 38,754	$ 33,194
Acquired software [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Amortizable intangibles, Gross carrying amount	$ 172,666	$ 33,103
Amortizable intangibles, Weighted Average Amortization Period	7 years	5 years
Amortizable intangibles, Accumulated Amortization	$ 32,880	$ 28,441
Trade name [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Amortizable intangibles, Gross carrying amount	$ 10,765	$ 3,331
Amortizable intangibles, Weighted Average Amortization Period	12 years	15 years
Amortizable intangibles, Accumulated Amortization	$ 1,747	$ 1,402
Leases acquired [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Amortizable intangibles, Gross carrying amount	$ 3,694
Amortizable intangibles, Weighted Average Amortization Period	9 years
Amortizable intangibles, Accumulated Amortization	$ 37